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Fuel Gas Code 

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Fuel Gas Code of New York State 



Publication Date: August 2007 



ISBN: 978-1-58001-579-0 (soft) 
ISBN: 978-1-58001-619-3 (loose-leaf) 



COPYRIGHT © 2007 
by 



International Code Council, Inc. ^"" ^^ j. ^ o. . 

500 New Jersey Avenue, NW, 6th Floor ^. Qt t <Jf 

Washington. D.C. 20001 Albany NY [Ssi 



ALL RIGHTS RESERVED. This work contains (1) portions of the International Code Council Codes (the "ICC Codes") and (2) 
material that is derivative of the ICC Codes, and (3) wholly original materials prepared by the New York State Department of State 
or by the New York State Fire Prevention and Building Code Council (the "Code Council"). The International Code Council has 
copyright ownership of the ICC Codes. The International Code Council and the New York State Department of State have joint 
copyright ownership of the material that is derivative of the ICC Codes. The New York State Department of State has copyright 
ownership of the wholly original materials prepared by the New York State Department of State or by the Code Council. As to the 
ICC Codes, all rights, including the right of reproduction in whole or in part in any form, are reserved to the International Code 
Council. As to the material that is derivative of the ICC Codes, all rights, including the right of reproduction in whole or in part in 
any form, are reserved to the International Code Council and the New York State Department of State, jointly. As to the wholly orig- 
inal materials prepared by the New York State Department of State or by the Code Council, all rights, including the right of repro- 
duction in whole or in part in any form, are reserved to the New York State Department of State. For information on permission to 
copy material exceeding fair use, please contact: International Code Council, Publications, 405 1 West Flossmoor Road, Country 
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Trademarks: "International Code Council," the "International Code Council" logo and the "International Fuel Gas Code" are trade- 
marks of the International Code Council, Inc. 



PRINTED IN THE U.S.A. 



ACiCMOWLEDGiyiENTS 

The Department of State gratefully acknowledges the following individuals who contributed to the development of the 
Plumbing/Mechanical/Fuel Gas Codes of New York State: 



STAT 

Lorraine A. Cortes-Vazquez 

Ronald E. Piester, AIA. 

John F. iViueller 
Richard F. Daines, iVi. D. 

Richard W. Svenson, Rl 

IVi. Patricia Smith 

Blaise Thomas, RE. 

iViatthew J. Driscoll 

Nicholas Altieri 
iViichael W. Behling 

David Ross 
Robert E. Olson 
L. Stephen Brescia 

Carmen R. Dubaldi, Jr. 
Joseph F. Sauenwein 
Gary B. Higbee, A.I.A. 
Thomas B. Vanderbeek, RE. 
John H. Flanigan 
Robert Hankin 
John J. Torpey 
Richard iVi. Vargas 



Chair - Secretary of State, NYS Department of State 

designee - Director, NYS Department of State 

Division of Code Enforcement & Administration 
Acting State Fire Administrator - NYS Office of Fire Prevention & Control 
Commissioner - NYS Department of Health 
:. designee - Director, NYS Department of Health 

Division of Environmental Health Protection 
Commissioner - NYS Department of Labor 

designee - NYS Department of Labor 

Associate Safety & Health Engineer, Engineering Services 
iViayor - City of Syracuse 

designee - City of Syracuse, Code Enforcement Inspection Office 
Legislator - County of Jefferson 

designee - Code Enforcement Official 
Councilman - Town of Horicon 
IViayor - Village of IViontgomery 

designee - Orange County, Division of Risk Management 
Fire Service Official 
Registered Architect 
Professional Engineer 
Code Enforcement Official 
Builders' Representative 
Trade Union Representative 
Persons with Disabilities Representative 

NYS Office of Advocate for Persons with Disabilities 



Lorraine A. Cortes-Vazquez 
Daniel E. Shapiro 
Ronald E. Piester, AIA 
Thomas P. iVIahar 
Raymond J. Andrews, R.A. 

Joseph Ball 



EMT ©F STATE 

Secretary of State 

First Deputy Secretary of State 

Director - Division of Code Enforcement & Administration 

Deputy Director - Division of Code Enforcement & Administration 

Assistant Director for Code Development, Division of Code 

Enforcement & Administration 
Office of Counsel, NYS Department of State 



BDI^G/iyiECHANICAlLiFUEL GAS CODES TECHNICAL SUBCOiyiiiiTTEE 

Cheryl Fischer, RE. (Chair), William Richardsen, RE. - Department of State Staff, Edward Angelone, Peter Campito, 
RE., Robert Cordell, Ronald Dunn, Ronald Leone, Michael Montysko, P.E., Douglas Page, P.E.M.P.A., Austin Sennett 

ADBiliVllSTeATD¥E TASGC GROUP 

Richard Thomson (Chair), Charles Bliss, RE., Thomas Romanowski - Department of State Staff Ben Curtis, Dan Kress, 
Jim Burton, Wayne iVi. Cichon, Richard Schunk 



FUEL GAS CODE OF NEW YORK STATE 



Content 

The Plumbing/Mechanical/Fuel Gas Codes of New York State combine language from the 2003 International Plumb- 
ing/Mechanical/Fuel Gas Codes® and New York modifications developed by the State Fire Prevention and Building 
Code Council and its Plumbing/Mechanical/Fuel Gas Codes Technical Subcommittee. In addition, administrative modi- 
fications in Chapter 1 of the 2007 Plumbing/Mechanical/Fuel Gas Codes were developed by the Department of State's 
Administrative Task Group. 

Marginal Markings 

Solid vertical lines in the margins within the body of the code indicate a technical change from the requirements of the 
2002 edition. Deletion indicators (-^) are provided in the margin where a paragraph or item has been deleted, except for 
Chapter 1 , which has been significantly changed, so there are no margin bars or deletion indicators. 

Letter Designations in Front of Section Numbers 

The content of sections in this code which begin with a letter designation are maintained by another code development 
committee in accordance with the following: [B] Building Code; [F] Fire Code; [M] Mechanical Code and [P] Plumbing 
Code. 



FUEL GAS CODE OF NEW YORK STATE 



CHAPTER 1 ADMINISTRATION . . . . . o . . . » . o , . . 1 
Section 

101 Title, Scope and Purpose 1 

102 Applicability 2 

103 Materials, Equipment and 

Methods of Construction 2 

104 Service Utilities 2 

105 Administration and Enforcement 2 

CHAPTER 2 DEFINITIONS , , . . . . . . o . . . . . o . . . . . 3 

Section 

201 General 3 

202 General Definitions 3 

CHAPTER 3 GENERAL REGULATIONS . o . , . , . 13 
Section 

301 General 13 

302 Structural Safety 14 

303 Appliance Location 16 

304 Combustion, Ventilation and 

Dilution Air 16 

305 Installation 19 

306 Access and Service Space 20 

307 Condensate Disposal 21 

308 Clearance Reduction 22 

309 Electrical 24 

310 Electrical Bonding 24 

CHAPTER 4 GAS PIPING INSTALLATIONS. ... 25 
Section 

401 General 25 

402 Pipe Sizing 25 

403 Piping Materials 57 

404 Piping System Installation 59 

405 Pipe Bends and Changes in 

Direction 60 

406 Inspection, Testing and Purging 60 

407 Piping Support 62 

408 Drips and Sloped Piping 62 

409 Shutoff Valves 62 

410 Flow Controls 63 

411 Appliance Connections 63 



412 Liquefied Petroleum Gas Motor 

Fuel-Dispensing Facilities 64 

413 Compressed Natural Gas Motor 

Fuel-Dispensing Facilities 65 

414 Supplemental and Standby 

Gas Supply 66 

415 Piping Support Intervals 66 

416 Overpressure Protection Devices 66 

CHAPTER 5 CHIMNEYS AND VENTS ......... 67 

Section 

501 General 67 

502 Vents 68 

503 Venting of Equipment 68 

504 Sizing of Category I Appliance 

Venting Systems 79 

505 Direct- Vent, Integral Vent, Mechanical Vent and 

Ventilation/Exhaust Hood Venting 94 

506 Factory-Built Chimneys 94 

CHAPTER 6 SPECIFIC APPLIANCES ........ KDS 

Section 

601 General 105 

602 Decorative Appliances for Installation 

in Fireplaces 105 

603 Log Lighters 105 

604 Vented Gas Fireplaces 

(Decorative Appliances) 105 

605 Vented Gas Fireplace Heaters 105 

606 Incinerators and Crematories 105 

607 Commercial-Industrial Incinerators 105 

608 Vented Wall Furnaces 106 

609 Floor Furnaces 106 

610 Duct Furnaces 106 

611 Nonrecirculating Direct-fired Industrial 

Air Heaters 107 

612 Recirculating Direct-fired Industrial Air 

Heaters 107 

613 Clothes Dryers 108 

614 Clothes Dryer Exhaust 108 

615 Sauna Heaters 108 

616 Engine and Gas Turbine-Powered 

Equipment 109 

617 Pool and Spa Heaters 109 

618 Forced-air Warm-air Furnaces 109 



FUEL GAS CODE OF MEW YORK STATE 



TABLE OF CONTENTS 



619 Conversion Burners 1 10 

620 Unit Heaters 110 

621 Unvented Room Heaters 1 10 

622 Vented Room Heaters 110 

623 Cooking Appliances 110 

624 Water Heaters Ill 

625 Refrigerators HI 

626 Gas-fired Toilets Ill 

627 Air-conditioning Equipment Ill 

628 Illuminating Appliances 112 

629 Small Ceramic Kilns 112 

630 Infrared Radiant Heaters 112 

631 Boilers 112 

632 Equipment Installed in Existing 

Unlisted Boilers 113 

633 Fuel Cell Power Plants 113 

634 Chimney Damper Opening 

Area 113 

CHAPTER 7 GASEOUS HYDROGEN 

SYSTEMS ...................... 115 

Section 

701 General 115 

702 General Definitions 115 

703 General Requirements 115 

704 Piping, Use and Handling 116 

705 Testing of Hydrogen Piping Systems 117 

706 Location of Gaseous 

Hydrogen Systems 118 

707 Operation and Maintenance of Gaseous Hydrogen 

Systems 119 

708 Design of Liquefied Hydrogen Systems 

Associated With Hydrogen Vaporization 
Operations 119 



APPENDIX B (IFGS) SIZING OF VENTING 

SYSTEMS SERVING APPLIANCES 
EQUIPPED WITH DRAFT 

HOODS, CATEGORY I 

APPLIANCES AND 

APPLIANCES LISTED 

FOR USE WITH TYPE B 

VENTS 135 

APPENDIX C (IFGS) RESERVED 145 

APPENDIX D (IFGS) RECOMMENDED 
PROCEDURE 

FOR SAFETY INSPECTION OF 
AN EXISTING APPLIANCE 
INSTALLATION 147 

APPENDIX E (IFGS) STRUCTURAL SAFETY . . 149 

151 



CHAPTER 8 REFERENCED STANDARDS. .... 121 



APPENDIX A (IFGS) SIZING AND CAPACITIES 

OF GAS PIPING ................ 12f 



FUEL GAS CODE OF NEW YORK STATE 



(DHAPT^ 



K 



ITLE, SCOPE Ai 



KDl.l Title. These provisions shall be known as the Fuel Gas 
Code of New York State and shall be cited as such and will be re- 
ferred to herein as "this code." 

lfD)1.2 Scope. The provisions of this code shall apply to the de- 
sign, installation, maintenance, alteration and inspection of 
fuel gas piping and equipment, fuel gas-fired appliances and 
fuel gas-fired appliance venting systems that are permanently 
installed and specifically addressed herein. 



Detached one-and two-family dwellings and multiple 
single-family dwellings (townhouses) not more than 
three stories in height above grade with separate means 
of egress and their accessory structures shall comply 
with the Residential Code of New York State. 

Fuel-gas piping systems in existing buildings that are un- 
dergoing repairs, alterations, changes in occupancy or 
construction of additions shall be permitted to comply 
with the provisions of the Existing Building Code of New 
York State. 



101.2.1 GaseoMS hydrogen systems. Gaseous hydrogen 
systems shall be regulated by Chapter 7 of this code. 



nis. These regulations cover piping 
systems for natural gas with an operating pressure of 125 
pounds per square inch gauge (psig) (862 kPa gauge) or less, 
and for LP-gas with an operating pressure of 20 psig (140 
kPa gauge) or less, except as provided in Section 402.6.1. 
Coverage shall extend from the point of delivery to the out- 
let of the equipment shutoff valves. Piping systems require- 
ments shall include design, materials, components, 
fabrication, assembly, installation, testing, inspection, oper- 
ation and maintenance. 



L Requirements for gas 
utilization equipment and related accessories shall include 
installation, combustion and ventilation air and venting and 
connections to piping systems. 

101.2.4 Systems amd eqeipmemt omtsMe the scope. This 
code shall not apply to the following: 

1 . Portable LP-gas equipment of all types that is not 
connected to a fixed fuel piping system. 

2 . Installation of farm equipment such as brooders , de- 
hydrators, dryers and irrigation equipment. 

Raw material (feedstock) applications except for 
piping to special atmosphere generators. 

Oxygen-fuel gas cutting and welding systems. 



3. 



5. Industrial gas applications using gases such as acet- 
ylene and acetylenic compounds, hydrogen, ammo- 
nia, carbon monoxide, oxygen and nitrogen. 

6. Petroleum refineries, pipeline compressor or pump- 
ing stations, loading terminals, compounding 
plants, refinery tank farms and natural gas process- 
ing plants. 

7. Integrated chemical plants or portions of such plants 
where flammable or combustible liquids or gases 
are produced by, or used in, chemical reactions. 

8. LP-gas installations at utility gas plants. 

9. Liquefied natural gas (LNG) installations. 

1 0. Fuel gas piping in power and atomic energy plants . 

1 1 . Proprietary items of equipment, apparatus or instru- 
ments such as gas-generating sets, compressors and 
calorimeters. 

12. LP-gas equipment for vaporization, gas mixing and 
gas manufacturing. 

13. Temporary LP-gas piping for buildings under con- 
struction or renovation that is not to become part of 
the permanent piping system. 

14. Installation of LP-gas systems for railroad switch 
heating. 

15. Installation of hydrogen gas, LP-gas and com- 
pressed natural gas (CNG) systems on vehicles. 

16. Except as provided in Section 401.1.1, gas piping, 
meters, gas pressure regulators and other appurte- 
nances used by the serving gas supplier in the distri- 
bution of gas, other than undiluted LP-gas. 



17. 



li 



Building design and construction, except as speci- 
fied herein. 



Piping systems for mixtures of gas and air within the 
flammable range with an operating pressure greater 
than 10 psig (69 kPa gauge). 

19. Portable fuel cell appliances that are neither con- 
nected to a fixed piping system nor interconnected 
to a power grid. 

101.2.5 Otlher feels. The requirements for the design, in- 
stallation, maintenance, alteration and inspection of me- 
chanical systems operating with fuels other than fuel gas 
shall be regulated by the Mechanical Code of New York 
State. 



use. The purpose of this code is to provide mini- 
mum standards to safeguard life or hmb, health, property and 
public welfare by regulating and controlling the design, con- 
struction, installation, quality of materials, location, operation 
and maintenance or use of fuel gas systems. 



FUEL GAS CODE OF MEW YORK STATE 



ADMINISTRATION 



SECTION 102 
APPLICABILITY 

102.1 General. Where, in any specific case, different sections 
of this code specify different materials, methods of construc- 
tion or other requirements, the most restrictive shall be applica- 
ble. Where there is a conflict between a general requirement 
and a specific requirement, the specific requirement shall be 
applicable. 

102.2 Other laws and regulations. The provisions of this 
code shall not be deemed to nullify any provisions of local, 
state or federal laws and regulations. 

102.3 Application of references. References to chapter or 
section numbers, or to provisions not specifically identified by 
number, shall be construed to refer to such chapter, section or 
provision of this code. 

102.4 Referenced standards. The standards referenced in this 
code shall be considered part of the requirements of this code to 
the prescribed extent of each such reference. Where differ- 
ences occur between provisions of this code and referenced 
standards, the provisions of this code shall apply. 

102.5 Appendix. The following appendix has been adopted 
and is made part of this code: 

Appendix E - Structural Safety 

102.6 Partial invalidity. In the event any part or provision of 
this code is held to be illegal or void, this shall not have the ef- 
fect of making void or illegal any of the other parts or 
provisions. 

102.7 Existing installations. Fuel gas systems lawfully in ex- 
istence at the time of the adoption of this code shall be permit- 
ted to have their use and maintenance continued if the use, 
maintenance or repair is in accordance with the original design 
and no hazard to life, health and property is created by such fuel 
gas system, and except as specifically covered in this code, the 
Property Maintenance Code of New York State, the Fire Code 
of New York State or the Existing Building Code of New York 
State. 



SECTION 103 

MATERIALS, EQUIPMENT AND METHODS OF 

CONSTRUCTION 

103.1 Approved materials and equipment. Materials, equip- 
ment and devices approved by the code enforcement official 
for use shall be constructed and installed in accordance with 
such approval. Materials, equipment and devices tested by an 
approved testing laboratory shall be permitted to be con- 
structed and installed in accordance with such approval. 

103.2 Used materials and equipment. Material, equipment 
and devices shall not be reused unless they meet the require- 
ments of this code for new materials. 

103.3 Alternate materials, design and methods of construc- 
tion and equipment. This code is not intended to prevent the 
use of any material or to prohibit any design or method of con- 
struction not specifically prescribed by this code, provided that 
any such alternative has been approved by the code enforce- 
ment official or the State Fire Prevention and Building Code 
Council. 



An alternative material, design or method of construction 
may only be approved when it is determined to comply with the 
intent of the provisions of this code and be at least equivalent of 
that prescribed in this code in quality, strength, effectiveness, 
fire resistance, durability and safety. 

103.4 Safeguards during construction. All construction 
work covered in this code, including any demolition, shall 
comply with the requirements of the Fire Code of New York 
State and Chapter 33 of the Building Code of New York State. 

103.5 Workmanship. Repairs, maintenance work, alterations 
or installations which are caused directly or indirectly by the 
enforcement of this code shall be executed and installed in a 
workmanlike manner and installed in accordance with this 
code and the manufacturer's installation instructions. 



SECTION 104 
SERVICE UTILITIES 

104.1 Connection of service utilities. Connections from a util- 
ity, source of energy, fuel or power to any building or system 
which is regulated by this code shall be made in accordance 
with the regulations of the public utility or other authority hav- 
ing jurisdiction. 

104.2 Temporary power. Temporary power shall comply 
with the requirements of Chapter 27 of the Building Code of 
New York State. 



SECTION 105 
ADMINISTRATION AND ENFORCEMENT 

105.1 Administration and enforcement. Administration and 
enforcement of the New York State Uniform Fire Prevention 
and Building Code shall be in accordance with local law, sub- 
ject to the minimum requirements set forth in the "Official 
Compilation of Codes Rules and Regulations of the State of 
New York," 19 NYCRR Part 1203, "Minimum Standards for 
Administration and Enforcement." State agencies shall com- 
ply with the minimum requirements set forth in 19 NYCRR 
Part 1204, "Administration and Enforcement by State Agen- 
cies." 

105.2 Modification. No town, village, city or county, nor any 
state agency charged with the administration and enforcement 
of this code may waive, modify or otherwise alter any provision 
of this code unless approved by the State Fire Prevention and 
Building Code Council in accordance with Section 379 of Arti- 
cle 1 8 of the Executive Law. 

105.3 Application for variance or appeal. Variance or appeal 
of any provision of this code shall be in accordance with the 
provisions of the "Official Compilation of Codes Rules and 
Regulations of the State of New York," 19 NYCRR Part 1205, 
"Variance Procedures." 



FUEL GAS CODE OF NEW YORK STATE 



OHAFTEB 



20U Scope. Unless otherwise expressly stated, the following 
words and terms shall, for the purposes of this code and stan- 
dard, have the meanings indicated in this chapter. 



^o Words used in the present tense in- 
clude the future; words in the masculine gender include the 
feminine and neuter; the singular number includes the plural 
and the plural, the singular. 

2® 1.3 Terms defiimed m otlier codes. Where terms are not de- 
fined in this code and are defined in the Building Code of New 
York State, Fire Code of New York State, Mechanical Code of 
New York State or Plumbing Code of New York State, such 
terms shall have meanings ascribed to them as in those codes. 

201.4 Terms mot delKmed. Where terms are not defined through 
the methods authorized by this section, such terms shall have 
ordinarily accepted meanings such as the context implies. 



ALTERATION. A change in a system that involves an exten- 
sion, addition or change to the arrangement, type or purpose of 
the original installation. 

ANODELESS EISEM. A transition assembly in which plasfic 
piping is installed and terminated above ground outside of a 
building. 

APPLIANCE (EQUIPMENT). Any apparatus or equipment 
that utilizes gas as a fuel or raw material to produce light, heat, 
power, refrigeration or air conditioning. 

APPLIANCE, FAN=ASSISTED COMBUSTION. An ap- 
pliance equipped with an integral mechanical means to either 
draw or force products of combustion through the combustion 
chamber or heat exchanger. 

APPLIANCE, FUEL-FIRED. An appliance that bums solid, 
liquid and/or gaseous fuel including, but not limited to, wood 
stoves, household cooking ranges, furnaces, boilers, water 
heaters, clothes dryers and gas-fired refrigerators. 



ACCESS (TO). That which enables a device, appliance or 
equipment to be reached by ready access or by a means that first 
requires the removal or movement of a panel, door or similar 
obstruction (see also "Ready access"). 

AM CONDITIONER, GAS=FMED. A gas-burning, auto- 
matically operated appliance for supplying cooled and/or de- 
humidified air or chilled liquid. 

AIR CONDITIONING. The treatment of air so as to control 
simultaneously the temperature, humidity, cleanness and dis- 
tribution of the air to meet the requirements of a conditioned 
space. 

AM, EXHAUST. Air being removed from any space or piece 
of equipment and conveyed directly to the atmosphere by 
means of openings or ducts. 



IT, A blower or fan used for the pur- 
pose of distributing supply air to a room, space or area. 



hausted. 



Air that is provided to replace air being ex- 



. GAS (EQUIPMENT). Any apparatus or 
equipment that utilizes gas as a fuel or raw material to produce 
light, heat, power, refrigeration or air conditioning. 

APPLIANCE, AUTOMATICALLY CONTROLLED. Ap- 
pliances equipped with an automatic burner ignition and safety 
shutoff device and other automatic devices which accomplish 
complete turn-on and shutoff of the gas to the main burner or 
burners, and graduate the gas supply to the burner or burners, 
but do not affect complete shutoff of the gas. 

APPLIANCE TYPE. 



nice). Any appli- 
ance in which the products of combustion at the point of en- 
trance to the flue under normal operating conditions have a 
temperature of 1,000°F (538°C) or less. 

Medninm-Ihieat applnamce. Any appliance in which the prod- 
ucts of combustion at the point of entrance to the flue under 
normal operating conditions have a temperature of more than 
1,000°F (538°C), but not greater than 2,000°F (1093°C). 

APPLIANCE, UNYENTEB. An appliance designed or in- 
stalled in such a manner that the products of combustion are not 
conveyed by a vent or chimney directly to the outside atmosphere. 

APPLIANCE, VENTED. An appliance designed and in- 
stalled in such a manner that all of the products of combustion 



FUEL GAS CODE OF MEW YORK STATE 



DEFINITIONS 



are conveyed directly from the appliance to the outside atmo- 
sphere through an approved chimney or vent system. 



base metal being joined. The fdler material is distributed be- 
tween the closely fitted surfaces of the joint by capillary action. 



APPROVED. Acceptable to the code enforcement official. 

APPROVED AGENCY. An established and recognized 
agency that is regularly engaged in conducting tests or furnish- 
ing inspection services. 

ATMOSPHERIC PRESSURE. The pressure of the weight of 
air and water vapor on the surface of the earth, approximately 
14.7 pounds per square inch (psi) (101 kPa absolute) at sea 
level. 

AUTHORITY HAVING JURISDICTION. The local gov- 
ernment, county government or state agency responsible for 
the administration and enforcement of an applicable regulation 
or law. 

AUTOMATIC IGNITION. Ignition of gas at the burner(s) 
when the gas controlling device is turned on, including 
reignition if the flames on the burner(s) have been extinguished 
by means other than by the closing of the gas controlling 
device. 

BAFFLE. An object placed in an appliance to change the di- 
rection of or retard the flow of air, air-gas mixtures or flue 

gases. 

BAROMETRIC DRAFT REGULATOR. A balanced 
damper device attached to a chimney, vent connector, breech- 
ing or flue gas manifold to protect combustion equipment by 
controlling chimney draft. A double-acting barometric draft 
regulator is one whose balancing damper is free to move in ei- 
ther direction to protect combustion equipment from both ex- 
cessive draft and backdraft. 

BOILER, LOW-PRESSURE. A self-contained appliance for 
supplying steam or hot water. 

Hot water heating boiler. A boiler in which no steam is 
generated, from which hot water is circulated for heating 
purposes and then returned to the boiler, and that operates at 
water pressures not exceeding 160 pounds per square inch 
gauge (psig) (1100 kPa gauge) and at water temperatures 
not exceeding 250°F (121°C) at or near the boiler outlet. 

Hot water supply boiler. A boiler, completely filled with 
water, which furnishes hot water to be used externally to it- 
self, and that operates at water pressures not exceeding 160 
psig (1100 kPa gauge) and at water temperatures not ex- 
ceeding 250°F (121°C) at or near the boiler outlet. 

Steam heating boiler. A boiler in which steam is generated 
and that operates at a steam pressure not exceeding 15 psig 
(100 kPa gauge). 



BROILER. A general term including salamanders, barbecues 
and other appliances cooking primarily by radiated heat, ex- 
cepting toasters. 

BTU. Abbreviation for British thermal unit, which is the quan- 
tity of heat required to raise the temperature of 1 pound (454 g) 
of water 1°F (0.56°C) (1 Btu = 1055 J). 

BURNER. A device for the final conveyance of the gas, or a 
mixture of gas and air, to the combustion zone. 

Induced-draft, A burner that depends on draft induced by a 
fan that is an integral part of the appliance and is located 
downstream from the burner. 

Power. A burner in which gas, air or both are supplied at 
pressures exceeding, for gas, the line pressure, and for air, 
atmospheric pressure, with this added pressure being ap- 
plied at the burner. 

CHIMNEY. A primarily vertical structure containing one or 
more flues, for the purpose of carrying gaseous products of 
combustion and air from an appliance to the outside atmo- 
sphere. 

Factory-built chimney. A listed and labeled chimney com- 
posed of factory-made components, assembled in the field 
in accordance with manufacturer's instructions and the con- 
ditions of the listing. 

Masonry chimney. A field-constructed chimney composed 
of solid masonry units, bricks, stones or concrete. 

Metal chlmniey. A field-constructed chimney of metal. 

CLEARANCE, The minimum distance through air measured 
between the heat-producing surface of the mechanical appli- 
ance, device or equipment and the surface of the combustible 
material or assembly. 

CLOTHES DRYER. An appliance used to dry wet laundry by 
means of heated air. Dryer classifications are as follows: 

Type 1. Factory-built package, multiple production. Pri- 
marily used in family living environment. Usually the 
smallest unit physically and in function output. 

Type 2. Factory-built package, multiple production. Used in 
business with direct intercourse of the function with the 
public. Not designed for use in individual family living en- 
vironment. 

CODE. These regulations, subsequent amendments thereto or 
any emergency rule or regulation that the administrative au- 
thority having jurisdiction has lawfully adopted. 



BRAZING. A metal-joining process wherein coalescence is 
produced by the use of a nonferrous filler metal having a melt- 
ing point above 1,000°F (538°C), but lower than that of the 



CODE ENFORCEMENT OFFICIAL. The officer or other 
designated authority charged with the administration and en- 
forcement of this code, or a duly authorized representative. 



FUEL GAS CODE OF NEW YORK STATE 



DEFI^SmONS 



COMBUSTIONo In the context of this code, refers to the rapid 
oxidation of fuel accompanied by the production of heat or heat 
and Hght. 



A vented appli- 
ance wherein the primary function lies in the aesthetic effect of 
the flames. 



COMBUSTION AM. Air necessary for complete combus- 
tion of a fuel, including theoretical air and excess air. 

COMBUSTION CHAMBER, The portion of an appliance 
within which combustion occurs. 



DECORATIVE APPLIANCES FOR INSTALLATION IN 
VENTED FIREPLACES. A vented appliance designed for 
installation within the fire chamber of a vented fireplace, 
wherein the primary function lies in the aesthetic effect of the 
flames. 



^S. Constituents resulting from 
the combustion of a fuel with the oxygen of the air, including 
inert gases, but excluding excess air. 

CONCEALED LOCATION. A location that cannot be ac- 
cessed without damaging permanent parts of the building 
structure or finish surface. Spaces above, below or behind 
readily removable panels or doors shall not be considered as 
concealed. 

CONCEALED PIPING. Piping that is located in a concealed 
location (see "Concealed location"). 

CONDENSATE, The hquid that condenses from a gas (in- 
cluding flue gas) caused by a reduction in temperature or in- 
crease in pressure. 



, The pipe that connects an approved appliance 
to a chimney, flue or vent. 

CONSTRUCTION DOCUMENTS, All of the written, 
graphic and pictorial documents prepared or assembled for de- 
scribing the design, location and physical characteristics of the 
elements of the project necessary for obtaining a mechanical 
permit. 



CDL. A manual or automatic device designed to regu- 
late the gas, air, water or electrical supply to, or operation of, a 
mechanical system. 



A unit consisting of a burner and 
its controls for installation in an appliance originally utilizing 
another fuel. 

COUNTER APPLIANCES, AppHances such as coffee brew- 
ers and coffee urns and any appurtenant water-heating equip- 
ment, food and dish warmers, hot plates, griddles, waffle 
bakers and other appliances designed for installation on or in a 
counter. 



h The maximum amount of gas input required per 
unit of time, usually expressed in cubic feet per hour, or Btu/h 
(1 Btu/h = 0.2931 W). 

DESIGN FLOOD ELEVATION, The elevation of the "de- 
sign flood," including wave height, relative to the datum speci- 
fied on the community's legally designated flood hazard map. 

DILUTION AM. Air that is introduced into a draft hood and 
is mixed with the flue gases. 

DIRECT" VENT APPLIANCES, Appliances that are con- 
structed and installed so that all air for combustion is derived 
directly from the outside atmosphere and all flue gases are dis- 
charged directly to the outside atmosphere. 



The pressure difference existing between the equip- 
ment or any component part and the atmosphere, that causes a 
continuous flow of air and products of combustion through the 
gas passages of the appliance to the atmosphere. 



L The pressure difference cre- 
ated by the action of a fan, blower or ejector, that is located 
between the appliance and the chimney or vent termination. 



The pressure difference created by a vent or 
chimney because of its height, and the temperature differ- 
ence between the flue gases and the atmosphere. 

DRAFT HOOD, A nonadjustable device built into an appli- 
ance, or made as part of the vent connector from an appliance, 
that is designed to (1) provide for ready escape of the flue gases 
from the appliance in the event of no draft, backdraft or stop- 
page beyond the draft hood; (2) prevent a backdraft from enter- 
ing the appliance and (3) neutralize the effect of stack action of 
the chimney or gas vent upon operation of the appliance. 

DRAFT REGULATOR. A device that functions to maintain a 
desired draft in the appliance by automatically reducing the 
draft to the desired value. 



The amount of gas that occupies 1 cubic foot 
(0.02832 m3) when at a temperature of 60°F (16°C), saturated 
with water vapor and under a pressure equivalent to that of 30 
inches of mercury (101 kPa). 



, A manually or automatically controlled device to 
regulate draft or the rate of flow of air or combustion gases. 



, The container placed at a low point in a system of piping 
to collect condensate and from which the condensate is 
removable. 



JAS. A gas having a moisture and hydrocarbon dew 
point below any normal temperature to which the gas piping is 
exposed. 



FUEL GAS CODE OF MEW YORK STATE 



DEFINITIONS 



DUCT FURNACE. A warm-air furnace normally installed in 
an air distribution duct to supply warm air for heating. This def- 
inition shall apply only to a warm-air heating appliance that de- 
pends for air circulation on a blower not furnished as part of the 
furnace. 

DUCT SYSTEM. A continuous passageway for the transmis- 
sion of air that, in addition to ducts, includes duct fittings, 
dampers, plenums, fans and accessory air-handling equipment. 

EQUIPMENT. See "AppHance." 

F RATING. The time period that the through-penetration 
firestop system limits the spread of fire through the penetration 
when tested in accordance with ASTM E 814. 

FIREPLACE. A fire chamber and hearth constructed of 
noncombustible material for use with solid fuels and provided 
with a chimney. 

Masonry fireplace. A hearth and fire chamber of solid ma- 
sonry units such as bricks, stones, listed masonry units or re- 
inforced concrete, provided with a suitable chimney. 

Factory-built fireplace. A fireplace composed of hsted 
factory-built components assembled in accordance with the 
terms of listing to form the completed fireplace. 

FIRE-RESISTANCE RATING. The period of time a build- 
ing element, component or assembly maintains the ability to 
confine a fire, continues to perform a given structural function, 
or both as determined by the tests, or the methods based on 
tests, prescribed in Section 703 of the Building Code of New 
York State. 

FIRING VALVE. A valve of the plug and barrel type designed 
for use with gas, and equipped with a lever handle for manual 
operation and a dial to indicate the percentage of opening. 

FLAME SAFEGUARD. A device that will automatically shut 
off the fuel supply to a main burner or group of burners when 
the means of ignition of such burners becomes inoperative, and 
when flame failure occurs on the burner or group of burners. 

FLOOD HAZARD AREA. The greater of the following two 
areas: 

1. The area within a floodplain subject to a 1 percent or 
greater chance of flooding in any given year. 

2. This area designated as a flood hazard area on a commu- 
nity's flood hazard map, or otherwise legally designated. 

FLOOR FURNACE. A completely self-contained furnace 
suspended from the floor of the space being heated, taking air 
for combustion from outside such space and with means for ob- 
serving flames and hghting the appliance from such space. 

Gravity type. A floor furnace depending primarily upon 
circulation of air by gravity. This classification shall also in- 
clude floor furnaces equipped with booster-type fans which 
do not materially restrict free circulation of air by gravity 
flow when such fans are not in operation. 



Fan type. A floor furnace equipped with a fan which pro- 
vides the primary means for circulating air. 

FLUE, APPLIANCE, The passage(s) within an appliance 
through which combustion products pass from the combustion 
chamber of the appliance to the draft hood inlet opening on an 
appliance equipped with a draft hood or to the outlet of the ap- 
pliance on an appliance not equipped with a draft hood. 

FLUE COLLAR. That portion of an appliance designed for 
the attachment of a draft hood, vent connector or venting 
system. 

FLUE GASES. Products of combustion plus excess air in ap- 
pliance flues or heat exchangers. 

FLUE LINER (LINING). A system or material used to form 
the inside surface of a flue in a chimney or vent, for the purpose 
of protecting the surrounding structure from the effects of com- 
bustion products and for conveying combustion products with- 
out leakage to the atmosphere. 

FUEL GAS. Fuel gases include: a natural gas, manufactured 
gas, liquefied petroleum gas, hydrogen gas and mixtures of D 
these gases. 

FUEL GAS UTILIZATION EQUIPMENT. See "Appli- 
ance." 

FURNACE. A completely self-contained heating unit that is 
designed to supply heated air to spaces remote from or adjacent 
to the appliance location. 

FURNACE, CENTRAL. A self-contained appliance for heat- 
ing air by transfer of heat of combustion through metal to the 
air, and designed to supply heated air through ducts to spaces 
remote from or adjacent to the appliance location. 

Downflow furnace. A furnace designed with airflow dis- 
charge vertically downward at or near the bottom of the fur- 
nace. 

Forced air furnace with cooling unit. A single-package 
unit, consisting of a gas-fired forced-air furnace of one of 
the types listed below combined with an electrically or fuel 
gas-powered summer air-conditioning system, contained in 
a common casing. 

Forced-air type. A central furnace equipped with a fan or 
blower which provides the primary means for circulation of 
air. 

Gravity furnace with booster fan. A furnace equipped 
with a booster fan that does not materially restrict free circu- 
lation of air by gravity flow when the fan is not in operation. 

Gravity type. A central furnace depending primarily on cir- 
culation of air by gravity. 

Horizontal forced-air type. A furnace with airflow 
through the appliance essentially in a horizontal path. 



FUEL GAS CODE OF NEW YORK STATE 



DEFBNmONS 



A furnace designed so that it 
can be installed with the airflow discharge in the upflow, 
horizontal or downflow direction. 



A furnace designed with airflow dis- 
charge vertically upward at or near the top of the furnace. 
This classification includes "highboy" furnaces with the 
blower mounted below the heating element and "lowboy" 
furnaces with the blower mounted beside the heating 
element. 

FURNACE, ENCLOSED. A specific heating, or heating and 
ventilating, furnace incorporating an integral total enclosure 
and using only outside air for combustion. 

FURNACE PLENUM. An air compartment or chamber to 
which one or more ducts are connected and which forms part of 
an air distribution system. 

GAS CONVENIENCE OUTLET, A permanendy mounted, 
manually operated device that provides the means for connect- 
ing an appliance to, and disconnecting an appliance from, the 
supply piping. The device includes an integral, manually oper- 
ated valve with a nondisplaceable valve member and is de- 
signed so that disconnection of an appliance only occurs when 
the manually operated valve is in the closed position. 

Q GASEOUS HYDROGEN SYSTEM. See Section 702.1. 



r. An installation of pipe, valves or fittings in- 
stalled on a premises or in a building and utilized to convey fuel 
gas. 

GAS UTILIZATION EQUIPMENT. An apphance that uti- 
lizes gas as a fuel or raw material or both. 



L Any location considered to be a 
fire hazard for flammable vapors, dust, combustible fibers or 
other highly combustible substances. The location is not neces- 
sarily categorized in the building code as a high-hazard group 
classification. 

HOUSE PIPING. See "Piping system." 

D HYDROGEN CUT=OFF ROOM, See Section 702.1. 

HYDROGEN GENERATING APPLIANCE. See Section 
702.1. 

IGNITION PILOT. A pilot that operates during the lighting 
cycle and discontinues during main burner operation. 

IGNITION SOURCE. A flame, spark or hot surface capable 
of igniting flammable vapors or fumes. Such sources include 
appliance burners, burner ignitors, and electrical switching de- 
vices. 



INDUSTRIAL AIR HEATERS, DIRECT=FIRED 
NONRECIRCULATING. A heater in which all the products 
of combustion generated by the burners are released into the air 
stream being heated. The purpose of the heater is to offset 
building heat loss by heating only outdoor air. 

INDUSTRIAL AIR HEATERS, DIRECT=FIRED RECIR= 
CULATING. A heater in which all the products of combustion 
generated by the burners are released into the air stream being 
heated. The purpose of the heater is to offset building heat loss 
by heating outdoor air, and, if applicable, indoor air. 

INFRARED RADIANT HEATER. A heater that directs a 
substantial amount of its energy output in the form of infrared 
radiant energy into the area to be heated. Such heaters are of ei- 
ther the vented or unvented type. 

JOINT, FLANGED, A joint made by bolting together a pair 
of flanged ends. 

JOINT, FLARED, A metal-to- metal compression joint in 
which a conical spread is made on the end of a tube that is com- 
pressed by a flare nut against a mating flare. 

JOINT, MECHANICAL. A general form of gas-tight joints 
obtained by the joining of metal parts through a positive-hold- 
ing mechanical construction, such as flanged joint, threaded 
joint, flared joint or compression joint. 

JOINT, PLASTIC ADHESIVE. A joint made in thermoset 
plastic piping by the use of an adhesive substance which forms 
a continuous bond between the mating surfaces without dis- 
solving either one of them. 

JOINT, PLASTIC HEAT FUSION. A joint made in thermo- 
plastic piping by heating the parts sufficiently to permit fusion 
of the materials when the parts are pressed together. 

JOINT, WELDED. A gas-tight joint obtained by the joining 
of metal parts in molten state. 

LABELED. Devices, equipment, appliances or materials to 
which have been affixed a label, seal, symbol or other identify- 
ing mark of a nationally recognized testing laboratory, inspec- 
tion agency or other organization concerned with product 
evaluation that maintains periodic inspection of the production 
of the above-labeled items and by whose label the manufac- 
turer attests to compliance with applicable nationally recog- 
nized standards. 



An appliance used to reduce combustible 
refuse material to ashes and which is manufactured, sold and 
installed as a complete unit. 



LIMIT CONTROL. A device responsive to changes in pres- 
sure, temperature or level for turning on, shutting off or throt- 
tling the gas supply to an appliance. 

LIQUEFIED PETROLEUM GAS or LPG (LP-G AS). Liq- 
uefied petroleum gas composed predominately of propane, 
propylene, butanes or butyl enes , or mixtures thereof that is gas- 
eous under normal atmospheric conditions, but is capable of 



FUEL GAS CODE OF NEW YORK STATE 



DEFDNITIONS 



being liquefied under moderate pressure at normal tempera- 
tures. 

LISTED. Equipment, appliances or materials included in a list 
published by a nationally recognized testing laboratory, in- 
spection agency or other organization concerned with product 
evaluation that maintains periodic inspection of production of 
listed equipment, appliances or materials, and whose listing 
states either that the equipment, apphance or material meets 
nationally recognized standards or has been tested and found 
suitable for use in a specified manner. The means for identify- 
ing listed equipment, appliances or materials may vary for each 
testing laboratory, inspection agency or other organization 
concerned with product evaluation, some of which do not rec- 
ognize equipment, appliances or materials as listed unless they 
are also labeled. The authority having jurisdiction shall utilize 
the system employed by the listing organization to identify a 
listed product. 

LIVING SPACE. Space within a dwelling unit utilized for liv- 
ing, sleeping, eating, cooking, bathing, washing and sanitation 
purposes. 

LOG LIGHTER. A manually operated solid fuel ignition ap- 
pliance for installation in a vented solid fuel-burning fireplace. 

LUBRICATED PLUG-TYPE VALVE. A valve of the plug 
and barrel type provided with means for maintaining a lubri- 
cant between the bearing surfaces. 

MAIN BURNER. A device or group of devices essentially 
forming an integral unit for the final conveyance of gas or a 
mixture of gas and air to the combustion zone, and on which 
combustion takes place to accomplish the function for which 
the appliance is designed. 

MECHANICAL EXHAUST SYSTEM. Equipment in- 
stalled in and made a part of the vent, which will provide a posi- 
tive induced draft. 

MEMBRANE PENETRATION. An opening made through 
one side (wall, floor or ceiling membrane) of an assembly. 

MEMBRANE-PENETRATION FIRESTOP. A material 
device or construction installed to resist for a prescribed time 
period, the passage of flame and heat through openings in a 
protective membrane in order to accommodate cables, cable 
trays, conduit, tubing, pipes or similar items. 

METER. The instrument installed to measure the volume of 
gas delivered through it. 

MODULATING. Modulating or throttiing is the action of a 
control from its maximum to minimum position in either pre- 
determined steps or increments of movement as caused by its 
actuating medium. 

OCCUPANCY. The purpose for which a building, or portion 
thereof, is utilized or occupied. 



OFFSET (VENT). A combination of approved bends that 
makes two changes in direction bringing one section of the vent 
out of line but into a line parallel with the other section. 

ORIFICE. The opening in a cap, spud or other device whereby 
the flow of gas is limited and through which the gas is dis- 
charged to the burner. 

OUTLET. A threaded connection or bolted flange in a pipe 
system to which a gas-burning appliance is attached. 

OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM 
(ODS). A system designed to act to shut off the gas supply to 
the main and pilot burners if the oxygen in the surrounding at- 
mosphere is reduced below a predetermined level. 

PENETRATION FIRESTOP. A through-penetration 
firestop or a membrane-penetration firestop. 

PILOT. A small flame that is utilized to ignite the gas at the 
main burner or burners. 

PIPING. Where used in this code, "piping" refers to either 
pipe or tubing, or both. 

Pipe. A rigid conduit of iron, steel, copper, brass or plastic. 

Tbblng. Semirigid conduit of copper, aluminum, plastic or 
steel. 

PIPING SYSTEM. All fuel piping, valves and fittings from 
the outlet of the point of delivery to the outlets of the equipment 
shutoff valves. 

PLASTIC, THERMOPLASTIC. A plastic that is capable of 
being repeatedly softened by increase of temperature and hard- 
ened by decrease of temperature. 

POINT OF DELIVERY. For natural gas systems, the point of 
delivery is the outlet of the service meter assembly, or the outlet 
of the service regulator or service shutoff valve where a meter is 
not provided. Where a valve is provided at the outlet of the ser- 
vice meter assembly, such valve shall be considered to be 
downstream of the point of delivery. For undiluted liquefied pe- 
troleum gas systems, the point of delivery shall be considered 
the outiet of the first-stage pressure regulator that provides uti- 
lization pressure, exclusive of line gas regulators, in the system. 

PORTABLE FUEL CELL APPLIANCE. A fuel cell genera- 
tor of electricity, which is not fixed in place. A portable fuel cell 
appliance utilizes a cord and plug connection to a grid-isolated 
load and has an integral fuel supply. 

PRESSURE DROP. The loss in pressure due to friction or ob- 
struction in pipes, valves, fittings, regulators and burners. 

PRESSURE TEST. An operation performed to verify the 
gas-tight integrity of gas piping following its installation or 
modification. 



FUEL GAS CODE OF NEW YORK STATE 



PURGE. To free a gas conduit of air or gas, or a mixture of gas 
and air. 



QUICiC=DI§CONNECT DEVICE. A hand-operated device 
that provides a means for connecting and disconnecting an ap- 
pUance or an appliance connector to a gas supply and that is 
equipped with an automatic means to shut off the gas supply 
when the device is disconnected. 

READY ACCESS (TO), That which enables a device, appli- 
ance or equipment to be directly reached, without requiring the 
removal or movement of any panel, door or similar obstruction 

(see "Access (to)"). 

REGISTERED DESIGN PROFESSIONAL. An individual 
who is a registered architect (RA) in accordance with Article 
147 of the New York State Education Law or a licensed profes- 
sional engineer (PE) in accordance with Article 145 of the New 
York State Education Law. 

REGULATOR. A device for controlling and maintaining a 
uniform supply pressure, either pounds-to-inches water col- 
umn (MP regulator) or inches-to-inches water column (appli- 
ance regulator). 

REGULATOR, GAS APPLIANCE. A pressure regulator for 
controlling pressure to the manifold of equipment. Types of ap- 
pliance regulators are as follows: 



1 . Spring type, limited adjustment. A regulator in which 
the regulating force acting upon the diaphragm is de- 
rived principally from a spring, the loading of which 
is adjustable over a range of not more than 15 percent 
of the outlet pressure at the midpoint of the adjust- 
ment range. 

2. Spring type, standard adjustment. A regulator in 
which the regulating force acting upon the diaphragm 
is derived principally from a spring, the loading of 
which is adjustable. The adjustment means shall be 
concealed. 



nge. A regulator for use with a single gas whose ad- 
justment means is capable of being positioned manually or 
automatically to two or more predetermined outlet pressure 
settings. Each of these settings shall be adjustable or 
nonadjustable. The regulator may modulate outlet pressures 
automatically between its maximum and minimum prede- 
termined outlet pressure settings. 



1. Spring type, nonadjustable. A regulator in which the 
regulating force acting upon the diaphragm is derived 
principally from a spring, the loading of which is not 
field adjustable. 

2. Weight type. A regulator in which the regulating force 
acting upon the diaphragm is derived from a weight or 
combination of weights. 



REGULATOR, LINE GAS PRESSURE. A device placed in 
a gas line between the service pressure regulator and the equip- 
ment for controlling, maintaining or reducing the pressure in 
that portion of the piping system downstream of the device. 

REGULATOR, MEDIUM=PRESSUME. A medium-pres- 
sure (MP) regulator reduces the gas piping pressure to the ap- 
pliance regulator or to the appliance utilization pressure. 

REGULATOR, PRESSURE. A device placed in a gas line for 
reducing, controlling and maintaining the pressure in that por- 
tion of the piping system downstream of the device. 

REGULATOR, SERVICE PRESSURE. A device installed 
by the serving gas supplier to reduce and limit the service line 
pressure to delivery pressure. 

RELIEF OPENING. The opening provided in a draft hood to 
permit the ready escape to the atmosphere of the flue products 
from the draft hood in the event of no draft, back draft, or stop- 
page beyond the draft hood, and to permit air into the draft 
hood in the event of a strong chimney updraft. 

RELIEF VALVE (DEVICE). A safety valve designed to fore- 
stall the development of a dangerous condition by relieving ei- 
ther pressure, temperature or vacuum in the hot water supply 
system. 



RELIEF VALVE, PRESSURE. An automatic valve that 
opens and closes a relief vent, depending on whether the pres- 
sure is above or below a predetermined value. 

RELIEF VALVE, TEMPERATURE. 

Reseating or §ellF=dosimg type. An automatic valve that 
opens and closes a relief vent, depending on whether the 
temperature is above or below a predetermined value. 



reset type, A valve that automatically opens a re- 
hef vent at a predetermined temperature and that must be 
manually returned to the closed position. 

RELIEF VALVE, VACUUM. A valve that automatically 
opens and closes a vent for relieving a vacuum within the hot 
water supply system, depending on whether the vacuum is 
above or below a predetermined value. 

RISER, GAS, A vertical pipe supplying fuel gas. 



ROOM HEATER, UNVENTED. 
heater." 



See "Unvented room 



A free-standing heating unit 
used for direct heating of the space in and adjacent to that in 
which the unit is located (see also "Vented room heater"). 



WITH SIZE OF 
EQUIPMENT, Rooms having a volume equal to at least 12 
times the total volume of a furnace or air-conditioning appli- 
ance and at least 16 times the total volume of a boiler. Total vol- 



FUEL GAS CODE OF MEW YORK STATE 



DEFINITIONS 



ume of the appliance is determined from exterior dimensions 
and is to include fan compartments and burner vestibules, when 
used. When the actual ceiling height of a room is greater than 8 
feet (2438 mm), the volume of the room is figured on the basis 
of a ceiling height of 8 feet (2438 mm). 



TRANSITION FITTINGS, PLASTIC TO STEEL. An 
adapter for joining plastic pipe to steel pipe. The purpose of this 
fitting is to provide a permanent, pressure-tight connection be- 
tween two materials which cannot be joined directly one to an- 
other. 



SAFETY SHUTOFF DEVICE. See "Flame safeguard." 

SHAFT. An enclosed space extending through one or more 
stories of a building, connecting vertical openings in succes- 
sive floors, or floors and the roof. 

SPECIFIC GRAVITY. As appUed to gas, specific gravity is 
the ratio of the weight of a given volume to that of the same vol- 
ume of air, both measured under the same condition. 

STATIONARY FUEL CELL POWER PLANT, A self-con- 
tained package or factory-matched packages which constitute 
an automatically operated assembly of integrated systems for 
generating electrical energy and recoverable thermal energy 
that is permanently connected and fixed in place. 

T RATING. The time period that the penetration firestop sys- 
tem, including the penetrating item, limits the maximum tem- 
perature rise to 325°F (163°C) above its initial temperature 
through the penetration on the nonfire side when tested in ac- 
cordance with ASTM E 814. 

THERMOSTAT. 

Electric switch type. A device that senses changes in tem- 
perature and controls electrically, by means of separate 
components, the flow of gas to the burner(s) to maintain se- 
lected temperatures. 

Integral gas valve type. An automatic device, actuated by 
temperature changes, designed to control the gas supply to 
the burner(s) in order to maintain temperatures between 
predetermined limits, and in which the thermal actuating el- 
ement is an integral part of the device. 

1. Graduating thermostat. A thermostat in which the 
motion of the valve is approximately in direct propor- 
tion to the effective motion of the thermal element in- 
duced by temperature change. 

2. Snap-acting thermostat. A thermostat in which the 
thermostatic valve travels instantly from the closed to 
the open position, and vice versa. 

THROUGH PENETRATION. An opening that passes 
through an entire assembly. 

THROUGH-PENETRATION FIRESTOP SYSTEM. An 

assemblage of specific materials or products that are designed, 
tested and fire-resistance rated to resist for a prescribed period 
of time the spread of fire through penetrations. The F and T rat- 
ing criteria for penetration firestop systems shall be in accor- 
dance with ASTM E 814. See definition of "F rating" and "T 
rating." 



UNIT HEATER. 

High-static pressure type. A self-contained, automatically 
controlled, vented appliance having integral means for cir- 
culation of air against 0.2 inch (15 mm H2O) or greater static 
pressure. Such appliance is equipped with provisions for at- 
taching an outlet air duct and, where the appliance is for in- 
door installation remote from the space to be heated, is also 
equipped with provisions for attaching an inlet air duct. 

Low-static pressure type. A self-contained, automatically 
controlled, vented appliance, intended for installation in the 
space to be heated without the use of ducts, having integral 
means for circulation of air. Such units are allowed to be 
equipped with louvers or face extensions made in accor- 
dance with the manufacturer's specifications. 

UNLISTED BOILER. A boiler not listed by a nationally rec- 
ognized testing agency. 

UNVENTED ROOM HEATER. An unvented heating appli- 
ance designed for stationary installation and utilized to provide 
comfort heating. Such appliances provide radiant heat or con- 
vection heat by gravity or fan circulation directly from the 
heater and do not utilize ducts. A wall-mounted unvented room 
heater would be of the type designed for insertion in or attach- 
ment to a wall or partition. A wall-mounted unvented room 
heater does not incorporate concealed venting arrangements in 
its construction and discharges all products of combustion air 
through the front into the room being heated. 

VALVE. A device used in piping to control the gas supply to 
any section of a system of piping or to an appliance. 

Automatic. An automatic or semiautomatic device consist- 
ing essentially of a valve and operator that control the gas 
supply to the burner(s) during operation of an appliance. 
The operator shall be actuated by application of gas pressure 
on a flexible diaphragm, by electrical means, by mechanical 
means, or by other approved means. 

Automatic gas shutoff. A valve used in conjunction with an 
automatic gas shutoff device to shut off the gas supply to a 
water-heating system. It shall be constructed integrally with 
the gas shutoff device or shall be a separate assembly. 

Equipment shutoff. A valve located in the piping system, 
used to isolate individual equipment for purposes such as 
service or replacement. 

Individual main burner. A valve that controls the gas sup- 
ply to an individual main burner. 

Main burner control. A valve that controls the gas supply 
to the main burner manifold. 

Manual main gas-control. A manually operated valve in 
the gas line for the purpose of completely turning on or shut- 



10 



FUEL GAS CODE OF NEW YORK STATE 



DEFlNmOMS 



ting off the gas supply to the apphance, except to pilot or pi- 
lots that are provided with independent shutoff . 

Mammal reset. An automatic shutoff valve installed in the 
gas supply piping and set to shut off when unsafe conditions 
occur. The device remains closed until manually reopened. 

Service shEtoff. A valve, installed by the serving gas sup- 
plier between the service meter or source of supply and the 
customer piping system, to shut off the entire piping system. 



To A pipe or other conduit composed of factory-made 
components, containing a passageway for conveying combus- 
tion products and air to the atmosphere, listed and labeled for 
use with a specific type or class of appliance. 

Special gas vemlt. A vent listed and labeled for use with 
listed Category II, III and IV appliances. 

Type B veelt. A vent listed and labeled for use with apph- 
ances with draft hoods and other Category I appliances that 
are listed for use with Type B vents. 

Type BW yquL A vent listed and labeled for use with wall 
furnaces. 

Type L vent. A vent listed and labeled for use with appli- 
ances that are listed for use with Type L or Type B vents. 

VENT CONNECTOR. (See "Connector"). 

VENT GASES. Products of combustion from appliances plus 
excess air plus dilution air in the vent connector, gas vent or 
chimney above the draft hood or draft regulator. 

VENTED APPLIANCE CATEGORIES. Appliances that 
are categorized for the purpose of vent selection are classified 
into the following four categories: 

Category I. An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 

Category II. An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that is 
capable of causing excessive condensate production in the 
vent. 



)ry III. An appliance that operates with a positive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 



^^w^fejry IV. An appliance that operates with a positive 
vent static pressure and with a vent gas temperature that is 
capable of causing excessive condensate production in the 
vent. 



lated by gravity or by a fan directly into the space to be heated 
through openings in the casing. This definition shall exclude 
floor furnaces, unit heaters and central furnaces as herein de- 
fined. 

VENTING SYSTEM. A condnuous open passageway from 
the flue collar or draft hood of an appliance to the outside atmo- 
sphere for the purpose of removing flue or vent gases. A vent- 
ing system is usually composed of a vent or a chimney and vent 
connector, if used, assembled to form the open passageway. 



1. A venting system de- 
signed to remove flue or vent gases by mechanical means, 
that consists of an induced draft portion under nonpositive 
static pressure or a forced draft portion under positive static 
pressure. 

a. Forced draft veetleg system. A portion of a venting 
system using a fan or other mechanical means to cause 
the removal of flue or vent gases under positive static 
vent pressure. 

b. Imdeced draft vemtieg system. A portion of a venting 
system using a fan or other mechanical means to cause 
the removal of flue or vent gases under nonpositive 
static vent pressure. 

c. Povyer ventimg system. A portion of a venting system 
using a fan or other mechanical means to cause the re- 
moval of flue or vent gases under positive static vent 
pressure. 

Natural draft ventliig system. A venting system designed 
to remove flue or vent gases under nonpositive static vent 
pressure entirely by natural draft. 



WALL HEATER, UNVENTED=TYPE. A room heater of 
the type designed for insertion in or attachment to a wall or par- 
tition. Such heater does not incorporate concealed venting ar- 
rangements in its construction and discharges all products of 
combustion through the front into the room being heated. 

WATER HEATER. Any heating appliance or equipment that 
heats potable water and supplies such water to the potable hot 
water distribution system. 



VENTED ROOM HEATER. A vented self-contained, 
free-standing, nonrecessed appliance for furnishing warm air 
to the space in which it is installed, directiy from the heater 
without duct connections. 

VENTED WALL FURNACE. A self-contained vented apph- 
ance complete with grilles or equivalent, designed for incorpo- 
ration in or permanent attachment to the structure of a building, 
mobile home or travel trailer, and furnishing heated air circu- 



FUEL GAS CODE OF WEW YORK STATE 



n 



12 FUEL GAS CODE OF NEW YORK STATE 



CHAPTER 



\AL 



\LM¥ 



GEiSSE^AL 

3®1.1 Scope. This chapter shall govern the approval and instal- 
lation of all equipment and appliances that comprise parts of 
the installations regulated by this code in accordance with Sec- 
tion 101.2. 

301.1.1 Other ffiiiels. The requirements for combustion and 
dilution air for gas-fired appliances shall be governed by 
Section 304. The requirements for combustion and dilution 
air for appliances operating with fuels other than fuel gas 
shall be regulated by the Mechanical Code of New York 
State. 



L2 Eeergy etnlnzation. Heating, ventilating and air-condi- 
tioning systems of all structures shall be designed and installed 
for efficient utilization of energy in accordance with the Energy 
Conservation Construction Code of New York State. 

301.3 Listed amd labeled. Appliances regulated by this code 
shall be listed and labeled. 

301.4 LabeMeg. Labeling shall be in accordance with the pro- 
cedures set forth in Sections 301.4.1 through 301.4.2.3. 

301.4.1 Testieg, An approved agency shall test a represen- 
tative sample of the appliances being labeled to the relevant 
standard or standards. The approved agency shall maintain a 
record of all of the tests performed. The record shall provide 
sufficient detail to verify compliance with the test standard. 



The approved 
agency shall periodically perform an inspection, which 
shall be in-plant if necessary, of the appliances to be labeled. 
The inspection shall verify that the labeled appliances are 
representative of the appliances tested. 



301.4.2.1 ledepemdeeL The agency to be approved shall 
be objective and competent. To confirm its objectivity, 
the agency shall disclose all possible conflicts of interest. 

301.4.2.2 Eqeipmemt. An approved agency shall have 
adequate equipment to perform all required tests. The 
equipment shall be periodically calibrated. 



An approved agency shall employ 
experienced personnel educated in conducting, supervis- 
ing and evaluating tests. 



L A permanent factory-applied name- 
plate(s) shall be affixed to appliances on which shall appear in 
legible lettering, the manufacturer's name or trademark, the 
model number, serial number and, for listed appliances, the 
seal or mark of the testing agency. A label shall also include the 
hourly rating in British thermal units per hour (Btu/h) (W); the 
type of fuel approved for use with the appliance; and the mini- 
mum clearance requirements. 

301.6 PlMmbimg conEectioinis. Potable water supply and build- 
ing drainage system connections to appliances regulated by 



this code shall be in accordance with the Plumbing Code of 
New York State. 

301.7 Feel types. Appliances shall be designed for use with the 
type of fuel gas to which they will be connected and the altitude 
at which they are installed. Appliances that comprise parts of 
the installation shall not be converted for the usage of a differ- 
ent fuel, except where approved and converted in accordance 
with the manufacturer's instructions. The fuel gas input rate 
shall not be increased or decreased beyond the limit rating for 
the altitude at which the appliance is installed. 



I isolatiom. Where means for isolation of vibra- 
tion of an appliance is installed, an approved means for support 
and restraint of that appliance shall be provided. 



r. Defective material or parts shall be replaced or 
repaired in such a manner so as to preserve the original ap- 
proval or listing. 



resistance. Appliances and supports that are ex- 
posed to wind shall be designed and installed to resist the wind 
pressures determined in accordance with the Building Code of 
New York State. 



301.11 Flood hazard. For structures located in flood hazard 
areas, the appliance, equipment and system installations regu- 
lated by this code shall be located at or above the design flood 
elevation and shall comply with the flood-resistant construc- 
tion requirements of the Building Code of New York State. 



mi The appliance, equipment and system installa- 
tions regulated by this code are permitted to be located below 
the design flood elevation provided that they are designed 
and installed to prevent water from entering or accumulating 
within the components and to resist hydrostatic and hydrody- 
namic loads and stresses, including the effects of buoyancy, 
during the occurrence of flooding to the design flood eleva- 
tion and shall comply with the flood-resistant construction 
requirements of the Building Code of New York State. 

301.12 Seismic resistamice. When earthquake loads are appli- 
cable in accordance with the Building Code of New York State, 
the supports shall be designed and installed for the seismic 
forces in accordance with Section 1621 of the Building Code of 
New York State. 



All ducts required for the installation of systems 
regulated by this code shall be designed and installed in accor- 
dance with the Mechanical Code of New York State. 

301.14 Rodemt proofflmg. Buildings or structures and the walls 
enclosing habitable or occupiable rooms and spaces in which 
persons live, sleep or work, or in which feed, food or foodstuffs 
are stored, prepared, processed, served or sold, shall be con- 
structed to protect against rodents in accordance with the 
Building Code of New York State. 



FUEL GAS CODE OF NEW YORK STATE 



13 



GENERAL REGULATIONS 



301.15 Prohibited location. The appliances, equipment and 
systems regulated by this code shall not be located in an eleva- 
tor shaft. 



SECTION 302 
STRUCTURAL SAFETY 

[B] 302.1 Structural safety. The building shall not be weak- 
ened by the installation of any gas piping. In the process of in- 
stalling or repairing any gas piping, the finished floors, walls, 
ceilings, tile work or any other part of the building or premises 
which is required to be changed or replaced shall be left in a 
safe structural condition in accordance with the requirements 
of Sections 302.2 through 302.7. 

[B] 302.2 Penetrations of floor/ceiling assemblies and 
fire-resistance-rated assemblies. Penetrations of floor/ceil- 
ing assemblies and assemblies required to have a fire-resis- 
tance rating shall be protected in accordance with Sections 
302.2.1 through 302.2.3. 

[B] 302.2.1 Installation details. Where sleeves are used, 
they shall be securely fastened to the assembly penetrated. 
The space between the item contained in the sleeve and the 
sleeve itself and any space between the sleeve and the as- 
sembly penetrated shall be protected in accordance with this 
section. Insulation and coverings on or in the penetrating 
item shall not penetrate the assembly unless the specific ma- 
terial used has been tested as part of the assembly in accor- 
dance with this section. 

[B] 302.2.2 Fire-resistance-rated walls. Penetrations into 
or through fire walls, fire barriers, smoke barrier walls and 
fire partitions shall comply with this section. 

[B] 302.2.2.1 Through penetrations. Through penetra- 
tions of fire-resistance-rated walls shall comply with 
Section 302.2.2.1.1 or 302.2.2.1.2. 

Exception: Where the penetrating items are steel, fer- 
rous or copper pipes or steel conduits, the annular 
space between the penetrating item and the fire-resis- 
tance-rated wall shall be permitted to be protected as 
follows: 

1 . In concrete or masonry walls where the pene- 
trating item is a maximum 6-inch (152 mm) 
nominal diameter and the opening is a maxi- 
mum 144 square inches (0.0929 m^), con- 
crete, grout or mortar shall be permitted 
where installed the full thickness of the wall or 
the thickness required to maintain the fire-re- 
sistance rating; or 

2. The material used to fill the annular space 
shall prevent the passage of flame and hot 
gases sufficient to ignite cotton waste where 
subjected to ASTM E 119 time temperature 
fire conditions under a minimum positive 
pressure differential of 0.01 inch (2.49 Pa) of 
water at the location of the penetration for the 
time period equivalent to the fire-resistance 
rating of the construction penetrated. 



[B] 302.2.2.1.1 Fire-resistaece-rated assem- 
blies. Penetrations shall be installed as tested in an 
approved fire-resistance-rated assembly. 

[B] 302.2.2.1.2 Through-penetration firestop 

system. Through penetrations shall be protected 
by an approved penetration firestop system in- 
stalled as tested in accordance with ASTM E 814, 
with a minimum positive pressure differential of 
0.01 inch (2.49 Pa) of water and shall have an F rat- 
ing of not less than the required fire-resistance rat- 
ing of the wall penetrated. 

[B] 302.2.2.2 Ducts and air transfer openings. Pen- 
etrations of fire-resistance-rated walls by ducts and 
air transfer openings that are not protected with fire 
dampers shall comply with this section. 

[B] 302.2.2.3 Dissimilar materials. Noncombustible 
penetrating items shall not connect to combustible 
items beyond the point of firestopping unless it can be 
demonstrated that the fire-resistance integrity of the 
wall is maintained. 

[B] 302.2.3 Horizontal assemblies. Penetrations of a 
floor, floor/ceiling assembly or the ceiling membrane of 
a roof/ceiling assembly shall be protected in accordance 
with Section 707 of the Building Code of New York State. 
Penetrations permitted by Exceptions 3 and 4 of Section 
707.2 of the Building Code of New York State shall com- 
ply with Sections 302.2.3.1 through 302.2.3.3. 

[B] 302.2.3.1 Through penetrations. Through pene- 
trations of fire-resistance-rated horizontal assemblies 
shall comply with Section 302.2.2. 1 . 1 or 302.2.2. 1 .2. 

Exceptions: 

1. Penetrations by steel, ferrous or copper con- 
duits, pipes, tubes, vents, concrete or masonry 
through a single fire-resistance-rated floor as- 
sembly where the annular space is protected 
with materials that prevent the passage of 
flame and hot gases sufficient to ignite cotton 
waste where subjected to ASTM E 119 time 
temperature fire conditions under a minimum 
positive pressure differential of 0.01 inch 
(2.49 Pa) of water at the location of the pene- 
tration for the time period equivalent to the 
fire-resistance rating of the construction pene- 
trated. Penetrating items with a maximum 
6-inch (152 mm) nominal diameter shall not 
be limited to the penetration of a single fire-re- 
sistance-rated floor assembly provided that 
the area of the penetration does not exceed 
144 square inches (0.0929 m^) in any 100 
square feet (9.3 m^) of floor area. 

2. Penetrations in a single concrete floor by 
steel, ferrous or copper conduits, pipes, tubes 
and vents with a maximum 6-inch (152 mm) 
nominal diameter provided concrete, grout or 
mortar is installed the full thickness of the 
floor or the thickness required to maintain the 
fire-resistance rating. The penetrating items 



14 



FUEL GAS CODE OF NEW YORK STATE 



GEMERAL REGULATBOMS 



with a maximum 6-inch (152 mm) nominal 
diameter shall not be limited to the penetration 
of a single concrete floor, provided that the 
area of the penetration does not exceed 144 
square inches (0.0929 m^). 
Electrical outlet boxes of any material are per- 
mitted provided that such boxes are tested for 
use in fire-resistance-rated assemblies and in- 
stalled in accordance with the tested 
assembly. 



[B] 302.23olol 
Penetrations shall be installed as tested in the ap- 
proved fire-resistance-rated assembly. 

[B] 3®2o2o3olo2 Throegh-penetiratnom firestop §y§= 
temo Through penetrations shall be protected by an 
approved through-penetration firestop system in- 
stalled and tested in accordance with ASTM E 814, 
with a minimum positive pressure differential of 0.01 
inch (2.49 Pa) of water. The system shall have an F rat- 
ing and a T rating of not less than 1 hour but not less 
than the required rating of the floor penetrated. 

ExcepMom: Floor penetrations contained and lo- 
cated within the cavity of a wall do not require a T 
rating. 



Penetrations of 
membranes that are part of a fire-resistance-rated hori- 
zontal assembly shall comply with Section 302.2.3.1.1 
or 302.2.3.1.2. Where floor/ceiling assemblies are re- 
quired to have a minimum 1-hour fire-resistance rating, 
recessed fixtures shall be installed such that the required 
fire resistance will not be reduced. 



Membrane penetrations by steel, ferrous or 
copper conduits, electrical outlet boxes, pipes, 
tubes, vents, concrete or masonry-penetrating 
items where the annular space is protected ei- 
ther in accordance with Section 302.2.3.1 or to 
prevent the free passage of flame and the prod- 
ucts of combustion. Such penetrations shall not 
exceed an aggregate area of 100 square inches 
(64 500 mm^) in any 100 square feet (9.3 m^) of 
ceiling area in assemblies tested without pene- 
trations. 

Membrane penetrations by listed electrical out- 
let boxes of any material are permitted, pro- 
vided such boxes have been tested for use in 
fire-resistance-rated assemblies and are in- 
stalled in accordance with the instructions in- 
cluded in the listing. 

The annular space created by the penetration of 
a fire sprinkler, provided it is covered by a metal 
escutcheon plate. 



[B] 302.23o3 NomSre-reslstamce-rated as 
Penetrations of horizontal assembhes without a required 
fire-resistance rating shall meet the requirements of Sec- 
tion 707 of the Building Code of New York State or shall 
comply with Sections 302.2.3.3.1 and 302.2.3.3.2. 



Noncombustible penetrating items that connect not 
more than three stories are permitted, provided that 
the annular space is filled with an approved 
noncombustible material to resist the free passage of 
flame and the products of combustion. 



lis. Penetrating items 
that connect not more than two stories are permitted, 
provided that the annular space is filled with an ap- 
proved material to resist the free passage of flame and 
the products of combustion. 

[B] 302.2o3.4 Dects aed air transfer opemiiiigs. Pene- 
trations of horizontal assemblies by ducts and air transfer 
openings that are not required to have dampers shall 
comply with this section. Ducts and air transfer openings 
that are protected with dampers shall comply with Sec- 
tion 607 of the Mechanical Code of New York State or 
Section 716 of the Building Code of New York State. 



imllar materialSo Noncombustible 
penetrating items shall not connect to combustible mate- 
rials beyond the point of firestopping unless it can be 
demonstrated that the fire-resistance integrity of the hor- 
izontal assembly is maintained. 

[B] 3®2o3 Cettimg, eotcliiiig amd boring m wood memberSo 
The cutting, notching and boring of wood members shall com- 
ply with Secdons 302.3.1 through 302.3.4 and Appendix E. 

[B] 3®23.1 Engmeered wood products. Cuts, notches and 
holes bored in trusses, laminated veneer lumber, glued-lam- 
inated members and I-joists are prohibited except where the 
effects of such alterations are specifically considered in the 
design of the member. 

[B] 302o3o2 Joist motclhsinig and boriego Notching at the ends 
of joists shall not exceed one-fourth the joist depth. Holes 
bored in joists shall not be within 2 inches (5 1 mm) of the top 
and bottom of the joist and their diameter shall not exceed 
one-third the depth of the member. Notches in the top or bot- 
tom of the joist shall not exceed one-sixth the depth and shall 
not be located in the middle one-third of the span. 



_ In exterior walls 
and bearing partitions, any wood stud is permitted to be cut 
or notched to a depth not exceeding 25 percent of its width. 
Cutting or notching of studs to a depth not greater than 40 
percent of the width of the stud is permitted in 
nonload-bearing partitions supporting no loads other than 
the weight of the partition. 



A hole not greater in diameter 
than 40 percent of the stud depth is permitted to be bored in 
any wood stud. Bored holes not greater than 60 percent of 
the depth of the stud are permitted in nonload-bearing parti- 
tions or in any wall where each bored stud is doubled, pro- 
vided not more than two such successive doubled studs are 
so bored. In no case shall the edge of the bored hole be 
nearer than % inch (15.9 mm) to the edge of the stud. Bored 
holes shall not be located at the same section of stud as a cut 
or notch. 



ises. Truss members and compo- 
nents shall not be cut, drilled, notched, spliced or otherwise al- 



FUEL GAS CODE OF MEW YORK STATE 



15 



GEfVSERAL REGULATIONS 



tered in any way without the written concurrence and approval 
of a registered design professional. Alterations resulting in the 
addition of loads to any member (e.g., HVAC equipment, water 
heaters) shall not be permitted without verification that the 
truss is capable of supporting such additional loading. 

[B] 302.5 Cutting, notching and boring holes in structural 

steel framing. The cutting, notching and boring of holes in 
structural steel framing members shall be as prescribed by the 
registered design professional. 

[B] 302.6 Cutting, notching and boring holes in 
cold-formed steel framing. Flanges and lips of load-bearing, 
cold-formed steel framing members shall not be cut or 
notched. Holes in webs of load-bearing, cold-formed steel 
framing members shall be permitted along the centerline of the 
web of the framing member and shall not exceed the dimen- 
sional limitations, penetration spacing or minimum hole edge 
distance as prescribed by the registered design professional. 
Cutting, notching and boring holes of steel floor/roof decking 
shall be as prescribed by the registered design professional. 

[B] 302.7 Cutting, notching and boring holes In 
nonstructural cold-formed steel wail framing. Flanges and 
lips of nonstructural cold-formed steel wall studs shall be per- 
mitted along the centerline of the web of the framing member, 
shall not exceed 1 V2 inches (38 mm) in width or 4 inches (102 
mm) in length, and the holes shall not be spaced less than 24 
inches (610 mm) center to center from another hole or less than 
10 inches (254 mm) from the bearing end. 



SECTION 303 
APPLIANCE LOCATION 

303.1 General. Appliances shall be located as required by this 
section, specific requirements elsewhere in this code and the 
conditions of the equipment and appliance listing. 

303.2 Hazardous locations. Appliances shall not be located in 
a hazardous location unless listed and approved for the specific 
installation. 

303.3 Prohibited locations. Appliances shall not be located in, 
or obtain combustion air from, any of the following rooms or 
spaces: 

1. Sleeping rooms. 

2. Bathrooms. 

3. Toilet rooms. 

4. Storage closets. 

5. Surgical rooms. 
Exceptions: 

1 . Direct- vent appliances that obtain all combustion air 
directly from the outdoors. 

2. Vented room heaters, wall furnaces, vented decora- 
tive appliances and decorative appliances for installa- 
tion in vented solid fuel-burning fireplaces, provided 
that the room meets the required volume criteria of 
Section 304.5. 

3. A single wall-mounted unvented room heater 
equipped with an oxygen depletion safety shutoff sys- 
tem and installed in a bathroom, provided that the in- 



put rating does not exceed 6,000 Btu/h (1 .76kW) and 
the bathroom meets the required volume criteria of 
Section 304.5. 

4. A single wall-mounted unvented room heater 
equipped with an oxygen depletion safety shutoff sys- 
tem and installed in a bedroom, provided that the in- 
put rating does not exceed 10,000 Btu/h (2.93 kW) 
and the bedroom meets the required volume criteria of 
Section 304.5. 

5 . Appliances installed in an enclosure in which all com- 
bustion air is taken from the outdoors, in accordance 
with Section 304.6. Access to such enclosure shall be 
through a solid weather-stripped door, equipped with 
an approved self-closing device. 

303.4 Protection from physical damage. Appliances shall not 
be installed in a location where subject to physical damage un- 
less protected by approved barriers meeting the requirements 
of the Fire Code of New York State. 

303.5 Indoor locations. Furnaces and boilers installed in clos- 
ets and alcoves shall be listed for such installation. 

303.6 Outdoor locations. Equipment installed in outdoor lo- 
cations shall be either listed for outdoor installation or provided 
with protection from outdoor environmental factors that influ- 
ence the operability, durability and safety of the equipment. 

303.7 Pit locations. Appliances installed in pits or excavations 
shall not come in direct contact with the surrounding soil. The 
sides of the pit or excavation shall be held back a minimum of 
12 inches (305 mm) from the appliance. Where the depth ex- 
ceeds 12 inches (305 mm) below adjoining grade, the walls of 
the pit or excavation shall be lined with concrete or masonry, 
such concrete or masonry shall extend a minimum of 4 inches 
(102 mm) above adjoining grade and shall have sufficient lat- 
eral load-bearing capacity to resist collapse. The appliance 
shall be protected from flooding in an approved manner. 



SECTION 304 (IFGS) 
COIVIBUSTION, VENTILATION AND DILUTION AIR 

304.1 General. Air for combustion, ventilation and dilution of 
flue gases for gas utilization equipment installed in buildings 
shall be provided by application of one of the methods pre- 
scribed in Sections 304.5 through 304.9. Where the require- 
ments of Section 304.5 are not met, outdoor air shall be 
introduced in accordance with one of the methods prescribed in 
Sections 304.6 through 304.9. Direct-vent appliances, gas ap- 
pHances of other than natural draft design and vented gas appli- 
ances other than Category I shall be provided with combustion, 
ventilation and dilution air in accordance with the equipment 
manufacturer's instructions. 

Exception: Type 1 clothes dryers that are provided with 
makeup air in accordance with Section 614.5. 

304.2 Appliance/equipment location. Equipment shall be lo- 
cated so as not to interfere with proper circulation of combus- 
tion, ventilation and dilution air. 

304.3 Draft hood/regulator location. Where used, a draft 
hood or a barometric draft regulator shall be installed in the 
same room or enclosure as the equipment served so as to pre- 



16 



FUEL GAS CODE OF NEW YORK STATE 



GENERAL REGULATIOiMS 



vent any difference in pressure between the hood or regulator 
and the combustion air supply. 



air provisioms. Makeup air requirements for 
the operation of exhaust fans, kitchen ventilation systems, 
clothes dryers and fireplaces shall be considered in determining 
the adequacy of a space to provide combustion air requirements. 



sdn The required volume of indoor 
air shall be determined in accordance with Section 304.5.1 or 
304.5.2, except that where the air infiltration rate is known to be 
less than 0.40 air changes per hour (ACH), Section 304.5.2 
shall be used. The total required volume shall be the sum of the 
required volume calculated for all appliances located within 
the space. Rooms communicating directly with the space in 
which the appliances are installed through openings not fur- 
nished with doors, and through combustion air openings sized 
and located in accordance with Section 304.5.3, are considered 
to be part of the required volume. 

3M.Sol Staedard metliodo The minimum required volume 
shall be 50 cubic feet per 1,000 Btu/h (4.8 m^/kW) of the ap- 
pliance input rating. 

3M.5.2 Kmowe anr-nnfiEtratiom-rate metlhodo Where the 
air infiltration rate of a structure is known, the minimum re- 
quired volume shall be determined as follows: 

For appliances other than fan-assisted, calculate volume 
using Equation 3-1. 

T. • .,. , 21/r' f I 

Required Volumeother ^ 



ACH {1,000 Btu/hr 

(EqeaMoim 3=1) 

For fan-assisted appHances, calculate volume using 
Equation 3-2. 

I5ft- 



ACH \ 1,000 Btu I hr 



Required VolumCfan > 

where: 

^ther = All appliances other than fan assisted (input in 
Btu/h). 

/fan = Fan-assisted appliance (input in Btu/h). 

ACH = Air change per hour (percent of volume of space 
exchanged per hour, expressed as a decimal). 

For purposes of this calculation, an infiltration rate 
greater than 0.60 ACH shall not be used in Equations 3-1 
and 3-2. 



L3 Imdoor ©pemmg size amd locatlomi. Openings used 
to connect indoor spaces shall be sized and located in accor- 
dance with Sections 304.5.3.1 and 304.5.3.2 (see Figure 
304.5.3). 

304oS.3,l Combimmg spaces oe the same story. Each 
opening shall have a minimum free area of 1 square inch 
per 1 ,000 Btu/h (2,200 mm^/kW) of the total input rating 
of all gas utilization equipment in the space, but not less 
than 100 square inches (0.06 m^). One opening shall 
commence within 12 inches (305 mm) of the top and one 
opening shall commence within 12 inches (305 mm) of 



the bottom of the enclosure. The minimum dimension of 
air openings shall be not less than 3 inches (76 mm). 

304oS.3,,2 Combimlng spaces le diffferemt stories. The 
volumes of spaces in different stories shall be considered 
as communicating spaces where such spaces are con- 
nected by one or more openings in doors or floors having 
a total minimum free area of 2 square inches per 1,000 
Btu/h (4402 mm^/kW) of total input rating of all gas utili- 
zation equipment. 

» Outdoor combestloE air. Outdoor combustion air shall 
be provided through opening(s) to the outdoors in accordance 
with Section 304.6.1 or 304.6.2. The minimum dimension of 
air openings shall be not less than 3 inches (76 mm). 

304.6.1 Two-permanent-opemmgs method. Two perma- 
nent openings, one commencing within 12 inches (305 mm) 
of the top and one commencing within 12 inches (305 mm) 
of the bottom of the enclosure, shall be provided. The open- 
ings shall communicate directly, or by ducts, with the out- 
doors or spaces that freely communicate with the outdoors. 

Where directly communicating with the outdoors, or 
where communicating with the outdoors through vertical 
ducts, each opening shall have a minimum free area of 1 
square inch per 4,000 Btu/h (550 mm^/kW) of total input 
rating of all equipment in the enclosure [see Figures 
304.6.1(1) and 304.6.1(2)]. 

Where communicating with the outdoors through hori- 
zontal ducts, each opening shall have a minimum free area 
of not less than 1 square inch per 2,000 Btu/h (1,100 
mm^/kW) of total input rating of all equipment in the enclo- 
sure [see Figure 304.6.1(3)]. 



Chimney or gas vent 




Opening 



Opening 



^n 



T \ \ \ n 



FIGURE 304.5.3 
THE BUBLDDMG (see Section 304.5.3) 



FUEL GAS CODE OF MEW YORK STATE 



17 



GENERAL REGULATSONS 



CHIMNEY OR GAS VENT 




VENTILATION LOUVERS 
(EACH END OF ATTIC) 



-CHIMNEY OH GAS VENT 




n 



INLET AIR DUCT 



LZL 



I i ^^^^ 



I . I . Il^l 



FIGURE 304.6.1(3) 

ALL AIR FROM OUTDOORS 

(see Section 304.6.1) 



V / 



VENTILATION LOUVERS F0R\^ 
UNHEATED CRAWL SPACE 



FIGURE 304.6.1(1) 

ALL AIR FROM OUTDOORS— INLET AIR FROM VENTILATED 

CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC 

(see Section 304.6.1) 



CHIMNEY OR GAS VENT 



CHIMNEY OR GAS VENT 




VENTILATION LOUVERS 
(EACH END OF ATTIC) 




OPENING 



ALTERNATE OPENING 
LOCATION 



nn 



INLET AIR DUCT 

(ENDS 1 FOOT (305 MM) 

ABOVE FLOOR) 



For SI: 1 foot = 304.8 mm. 



FIGURE 304.6.1(2) 

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC 

(see Section 304.6.1) 



FIGURE 304.6.2 

SINGLE COMBUSTION AIR OPENING, 

ALL AIR FROM THE OUTDOORS 

(see Section 304.6.2) 



304.6.2 One-permanent-opening method. One perma- 
nent opening, commencing within 12 inches (305 mm) of 
the top of the enclosure, shall be provided. The equipment 
shall have clearances of at least 1 inch (25 mm) from the 
sides and back and 6 inches (152 mm) from the front of the 
appliance. The opening shall directly communicate with the 
outdoors or through a vertical or horizontal duct to the out- 
doors or spaces that freely communicate with the outdoors 
[see Figure 304.6.2] and shall have a minimum free area of 1 
square inch per 3,000 Btu/h (734 mm^/kW) of the total input 
rating of all equipment located in the enclosure, and not less 
than the sum of the areas of all vent connectors in the space. 



FUEL GAS CODE OF NEW YORK STATE 



3®4o7 ComMmatioim nedoor annd ©inMoor combunstDoini air. 
The use of a combination of indoor and outdoor combustion air 
shall be in accordance with Sections 304.7. 1 through 304.7.3. 



J A Emdoor openininigs. Where used, openings connect- 
ing the interior spaces shall comply with Section 304.5.3. 

3(D4»7.2 Oinldoor opemmg Bocaltiioinio Outdoor opening(s) 
shall be located in accordance with Section 304.6. 



.7o3 Oetdoor opemmgCs) size. The outdoor opening(s) 
size shall be calculated in accordance with the following: 

1. The ratio of interior spaces shall be the available vol- 
ume of all communicating spaces divided by the re- 
quired volume. 

2. The outdoor size reduction factor shall be one minus 
the ratio of interior spaces. 

3. The minimum size of outdoor opening(s) shall be the 
full size of outdoor opening(s) calculated in accor- 
dance with Section 304.6, multiphed by the reduction 
factor. The minimum dimension of air openings shall 
be not less than 3 inches (76 mm). 

3M.8 EnngSmeered imstallatnoinis. Engineered combustion air 
installations shall provide an adequate supply of combustion, 
ventilation and dilution air and shall be approved. 

304.9 Meclhamkal combustiomi air sepply. Where all combus- 
tion air is provided by a mechanical air supply system, the com- 
bustion air shall be supplied from the outdoors at a rate not less 
than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 mVmin 
per kW) of total input rating of all appliances located within the 
space. 

304.9.1 Makeinp air. Where exhaust fans are installed, 
makeup air shall be provided to replace the exhausted air. 



, Each of the appliances served 
shall be interlocked with the mechanical air supply system 
to prevent main burner operation when the mechanical air 
supply system is not in operation. 

304o9o3 ComtoSinied comlbiuisftioini air amd vemiltnlatioini air 
systemm. Where combustion air is provided by the building's 
mechanical ventilation system, the system shall provide the 
specified combustion air rate in addition to the required ven- 
tilation air. 



. The required size of openings for 
combustion, ventilation and dilution air shall be based on the net 
free area of each opening. Where the free area through a design 
of louver, grille or screen is known, it shall be used in calculating 
the size opening required to provide the free area specified. 

D Where the design and free area of louvers, grilles or screens are 
not known, it shall be assumed that wood louvers will have 
25-percent free area and metal louvers, grilles and screens will 
have 50-percent free area. Screens shall have a mesh size not 
smaller than 74 inch (6.4 mm). Nonmotorized louvers and grilles 
shall be fixed in the open position. Motorized louvers shall be in- 
terlocked with the equipment so that they are proven to be in the 

E full open position by use of a blade position switch, prior to burner 
ignition and during burner operation. Means shall be provided to 
prevent the burner from igniting if the louvers fail to open during 
burner start-up and to shut down the burner if the louvers close 
during operation. 



3(04.11 Combmsliomi air declts. Combustion air ducts shall 
comply with all of the following: 

1. Ducts shall be of galvanized steel complying with Chap- 
ter 6 of the Mechanical Code of New York State or of 
equivalent corrosion-resistant material approved for this 
application. 

2. Ducts shall terminate in an unobstructed space allowing 
free movement of combustion air to the appliances. 

3. Ducts shall serve a single enclosure. 

4. Ducts shall not serve both upper and lower combustion 
air openings where both such openings are used. The 
separation between ducts serving upper and lower com- 
bustion air openings shall be maintained to the source of 
combustion air. 

5. Ducts shall not be screened where terminating in an attic 
space. 

6. Horizontal upper combustion air ducts shall not slope 
downward toward the source of combustion air. 

7. The remaining space surrounding a chimney liner, gas 
vent, special gas vent or plastic piping installed within a 
masonry, metal or factory-built chimney shall not be 
used to supply combustion air. 

Exceptioms Direct-vent gas-fired appliances de- 
signed for installation in a solid fuel-burning fireplace 
where installed in accordance with the listing and the 
manufacturer's instructions. 

8. Combustion air intake openings located on the exterior 
of a building shall have the lowest side of such openings 
located not less than 12 inches (305 mm) vertically from 
the adjoining grade level. 



1.12 Protectiomi ffTOm fames amd gases. Where corrosive or 
flammable process fumes or gases, other than products of com- 
bustion, are present, means for the disposal of such fumes or 
gases shall be provided. Such fumes or gases include carbon 
monoxide, hydrogen sulfide, ammonia, chlorine and 
halogenated hydrocarbons. 

In barbershops, beauty shops, nail salons and other facilities 
where chemicals that generate corrosive or flammable prod- 
ucts, such as aerosol sprays, are routinely used, 
nondirect-vent-type appliances shall be located in an equip- 
ment room separated with fixed partitions from other areas 
with provisions for all combustion air and dilution air from the 
outdoors to minimize infiltration of such vapor, fumes and 
gases. Direct-vent appliances shall be installed in accordance 
with the appliance manufacturer's installation instructions. 



305.1 Gemeral, Equipment and apphances shall be installed as 
required by the terms of their approval, in accordance with the 
conditions of listing, the manufacturer's instructions and this 
code. Manufacturers' installation instructions shall be avail- n 
able on the job site at the time of inspection. Where a code pro- 
vision is less restrictive than the conditions of the listing of the 
equipment or appliance or the manufacturer's installation in- L 



FUEL GAS CODE OF MEW YORK STATE 



GENERAL REGULATBONS 



structions, the conditions of the listing and the manufacturer's 
installation instructions shall apply. 

305.2 Hazardous area. Equipment and appliances having an 
ignition source shall not be installed in Group H occupancies or 
control areas where open use, handling or dispensing of com- 
bustible, flammable or explosive materials occurs. 

305.3 Elevation of Igmtioe source. Equipment and appliances 
having an ignition source shall be elevated such that the source 
of ignition is not less than 18 inches (457 mm) above the floor 
in hazardous locations and public garages, private garages, re- 
pair garages, motor fuel-dispensing facilities and parking ga- 
rages. For the purpose of this section, rooms or spaces that are 
not part of the living space of a dwelling unit and that commu- 
nicate directly with a private garage through openings shall be 
considered to be part of the private garage. 

Exception: Elevation is not required for fuel-gas fired ap- 
pliances listed and labeled in accordance with ANSI 
Z2 1.1 0.1 or ANSI Z2 1.1 0.3 as resistant to flammable vapor 
ignition. 

305.4 Public garages. Appliances located in public garages, 
motor fuel-dispensing facilities, repair garages or other areas 
frequented by motor vehicles shall be installed a minimum of 8 
feet (2438 mm) above the floor. Where motor vehicles exceed 6 
feet (1829 mm) in height and are capable of passing under an 
appliance, appliances shall be installed a minimum of 2 feet 
(610 mm) higher above the floor than the height of the tallest 
vehicle. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle im- 
pact and installed in accordance with Section 305.3 and 
NFPA 88B. 

305.5 Private garages. Appliances located in private garages 
shall be installed with a minimum clearance of 6 feet (1829 
mm) above the floor. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle im- 
pact and installed in accordance with Section 305.3. 

305.6 Construction and protection. Boiler rooms and fur- 
nace rooms shall be protected as required by the Building Code 
of New York State. 

305.7 Clearances from grade. Equipment and appliances in- 
stalled at grade level shall be supported on a level concrete slab 
or other approved material extending above adjoining grade or 
shall be suspended a minimum of 6 inches (152 mm) above ad- 
joining grade. 

305.8 Clearances to combustible construction. Heat-pro- 
ducing equipment and appliances shall be installed to maintain 
the required clearances to combustible construction as speci- 
fied in the hsting and manufacturer's instructions. Such clear- 
ances shall be reduced only in accordance with Section 308. 
Clearances to combustibles shall include such considerations 
as door swing, drawer pull, overhead projections or shelving 
and window swing. Devices, such as door stops or limits and 
closers, shall not be used to provide the required clearances. 



SECTION 306 
ACCESS AND SERVICE 

Clearances for maintenance and replacement. 
Clearances around appliances to elements of permanent con- 
struction, including other installed appliances, shall be suffi- 
cient to allow inspection, service, repair or replacement 
without removing such elements of permanent construction or 
disabling the function of a required fire-resistance-rated 
assembly. 



.2 Appliances in rooms. Rooms containing appli- 
ances requiring access shall be provided with a door and an un- 
obstructed passageway measuring not less than 36 inches (914 
mm) wide and 80 inches (2032 mm) high. 

Exception: Within a dwelling unit, appliances installed in a 
compartment, alcove, basement or similar space shall be 
provided with access by an opening or door and an unob- 
structed passageway measuring not less than 24 inches (610 
mm) wide and large enough to allow removal of the largest 
appliance in the space, provided that a level service space of 
not less than 30 inches (762 mm) deep and the height of the 
appliance, but not less than 30 inches (762 mm), is present at 
the front or service side of the appliance with the door open. 

[M] 306.3 Appliances In attics. Attics containing appliances 
requiring access shall be provided with an opening and unob- 
structed passageway large enough to allow removal of the larg- 
est component of the appliance. The passageway shall not be 
less than 30 inches (762 mm) high and 22 inches (559 mm) 
wide and not more than 20 feet (6096 mm) in length when mea- 
sured along the centerline of the passageway from the opening 
to the equipment. The passageway shall have continuous solid 
flooring not less than 24 inches (610 mm) wide. A level service 
space not less than 30 inches (762 mm) deep and 30 inches (762 
mm) wide shall be present at the front or service side of the 
equipment. The clear access opening dimensions shall be a 
minimum of 20 inches by 30 inches (508 mm by 762 mm), 
where such dimensions are large enough to allow removal of 
the largest component of the appliance. 



1. The passageway and level service space are not re- 
quired where the appliance is capable of being ser- 
viced and removed through the required opening. 

2. Where the passageway is not less than 6 feet (1829 
mm) high for its entire length, the passageway shall be 
not greater than 50 feet (15 250 mm) in length. 

[M] 306.3.1 Electrical requirements. A lighting fixture con- 
trolled by a switch located at the required passageway opening 
and a receptacle outlet shall be provided at or near the equip- 
ment location in accordance with Chapter 27 of the Building 
Code of New York State. 



lances under floors. Under-floor spaces con- 
taining appliances requiring access shall be provided with an 
access opening and unobstructed passageway large enough to 
remove the largest component of the appliance. The passage- 
way shall not be less than 30 inches (762 mm) high and 22 
inches (559 mm) wide, nor more than 20 feet (6096 mm) in 
length when measured along the centerline of the passageway 
from the opening to the equipment. A level service space not 



20 



FUEL GAS CODE OF NEW YORK STATE 



less than 30 inches (762 mm) deep and 30 inches (762 mm) 
wide shall be present at the front or service side of the appli- 
ance. If the depth of the passageway or the service space ex- 
ceeds 12 inches (305 mm) below the adjoining grade, the walls 
of the passageway shall be lined with concrete or masonry ex- 
tending 4 inches (102 mm) above the adjoining grade and hav- 
ing sufficient lateral-bearing capacity to resist collapse. The 
clear access opening dimensions shall be a minimum of 22 
inches by 30 inches (559 mm by 762 mm), where such dimen- 
sions are large enough to allow removal of the largest compo- 
nent of the appliance. 



1. The passageway is not required where the level ser- 
vice space is present when the access is open and the 
appliance is capable of being serviced and removed 
through the required opening. 

2. Where the passageway is not less than 6 feet high 
(1829 mm) for its entire length, the passageway shall 
not be limited in length. 



306.4.1 Electrical reqmrememlts. A lighting fixture con- 
trolled by a switch located at the required passageway opening 
and a receptacle outlet shall be provided at or near the equip- 
ment location in accordance with Chapter 27 of the Building 
Code of New York State. 

[M] 3(0)(5.S AppMairace§ om roofe or elevated stmictereSo Where 
apphances requiring access are installed on roofs or elevated 
structures at a height exceeding 16 feet (4877 mm), such access 
shall be provided by a permanent approved means of access, 
the extent of which shall be from grade or floor level to the ap- 
pliance's level service space. Such access shall not require 
climbing over obstructions greater than 30 inches high (762 
mm) or walking on roofs having a slope greater than four units 
vertical in 12 units horizontal (33-percent slope). 

Permanent exterior ladders installed to provide the required 
access shall comply with the following minimum design crite- 
ria: 

1. The side railing shall extend above the parapet or roof 
edge not less than 30 inches (762 mm). 

2. Ladders shall have a rung spacing not to exceed 14 inches 
(356 mm) on center. 

3. Ladders shall have a toe spacing not less than 6 inches 
(152 mm) deep. 

4. There shall be a minimum of 18 inches (457 mm) be- 
tween rails. 

5. Rungs shall have a minimum diameter of 0.75-inch (19 
mm) and shall be capable of withstanding a 300-pound 
(136.1 kg) load. 

6. Ladders over 30 feet (9144 mm) in height shall be pro- 
vided with offset sections and landings capable of with- 
standing a load of 100 pounds per square foot (488.2 
kg/m2). 

7. Ladders shall be protected against corrosion by approved 
means. 



Catwalks installed to provide the required access shall be not 
less than 24 inches wide (610 mm) and shall have railings as re- 
quired for service platforms. 

n: This section shall not apply to Group R-3 occu- 



pancies. 

[M] 306.5.1 Sloped roofs. Where appliances are installed 
on a roof having a slope of three units vertical in 12 units 
horizontal (25 -percent slope) or greater and having an edge 
more than 30 inches (762 mm) above grade at such edge, a 
level platform shall be provided on each side of the appli- 
ance to which access is required by the manufacturer's in- 
stallation instructions for service, repair or maintenance. 
The platform shall not be less than 30 inches (762 mm) in 
any dimension and shall be provided with guards in accor- 
dance with Section 306.6. 



L2 Electrical reqiiireirtnieinits. A receptacle outlet 
shall be provided at or near the equipment location in accor- 
dance with Chapter 27 of the Building Code of New York 
State. 

[M] 306.6 Gmards. Guards shall be provided where appli- 
ances, fans or other components that require service are located 
within 1 feet (3048 mm) of a roof edge or open side of a walk- 
ing surface and such edge or open side is located more than 30 
inches (762 mm) above the floor, roof or grade below. The 
guard shall extend not less than 30 inches (762 mm) beyond 
each end of such appliances, fans or other components and the 
top of the guard shall be located not less than 42 inches (1067 
mm) above the elevated surface adjacent to the guard. The 
guard shall be constructed so as to prevent the passage of a 
21 -inch-diameter (533 mm) sphere and shall comply with the 
loading requirements for guards specified in the Building Code 
of New York State. 



COWDENSATE DDSPQSAL 

FEeE=tarmimg appIiaEces. Liquid combustion by-prod- 
ucts of condensing appliances shall be collected and dis- 
charged to an approved plumbing fixture or disposal area in 
accordance with the manufacturer's installation instructions. 
Condensate piping shall be of approved corrosion-resistant 
material and shall not be smaller than the drain connection on 
the appliance. Such piping shall maintain a minimum slope in 
the direction of discharge of not less than one-eighth unit verti- 
cal in 12 units horizontal (1 -percent slope). 



I sizes. Components of the 
condensate disposal system shall be cast iron, galvanized steel, 
copper, polyethylene, ABS, CPVC or PVC pipe or tubing. All 
components shall be selected for the pressure and temperature 
rating of the installation. Condensate waste and drain line size 
shall be not less than V4-inch internal diameter (19 mm) and 
shall not decrease in size from the drain connection to the place 
of condensate disposal. Where the drain pipes from more than 
one unit are manifolded together for condensate drainage, the 
pipe or tubing shall be sized in accordance with an approved 
method. All horizontal sections of drain piping shall be in- 
stalled in uniform alignment at a uniform slope. 



FUEL GAS CODE OF NEW YORK STATE 



21 



GENERAL REGULATSONS 



307.3 Traps. Condensate drains shall be trapped as required by 
the equipment or appliance manufacturer. 



SECTION 308 (IFGS) 
CLEARANCE REDUCTION 

308.1 Scope. This section shall govern the reduction in re- 
quired clearances to combustible materials and combustible 
assemblies for chimneys, vents, appliances, devices and equip- 
ment. Clearance requirements for air-conditioning equipment 
and central heating boilers and furnaces shall comply with Sec- 
tions 308.3 and 308.4. 

308.2 Reduction table. The allowable clearance reduction 
shall be based on one of the methods specified in Table 308.2 or 



shall utilize an assembly listed for such application. Where re- 
quired clearances are not listed in Table 308.2, the reduced 
clearances shall be determined by linear interpolation between 
the distances listed in the table. Reduced clearances shall not be 
derived by extrapolation below the range of the table. The re- 
duction of the required clearances to combustibles for listed 
and labeled appliances and equipment shall be in accordance 
with the requirements of this section except that such clear- 
ances shall not be reduced where reduction is specifically pro- 
hibited by the terms of the appliance or equipment listing [see 
Figures 308.2(1) through 308.2(3)]. 

308.3 Clearaeces for indoor air-conditioning equipment. 
Clearance requirements for indoor air-conditioning equipment 
shall comply with Sections 308.3.1 through 308.3.5. 



TABLE 308.2^"'' 
REDUCTION OF CLEARANCES WITH SPECIFIED FORWIS OF PROTECTION 



TYPE OF PROTECTION APPLIED TO 

AND COVERING ALL SURFACES OF COMBUSTIBLE 

MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE 

REQUIRED CLEARANCE WITH NO PROTECTION 

[see Figures 308.2(1), 308.2(2) and 308.2(3)] 


WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM 
APPLIANCE, VENT CONNECTOR OR SINGLE-WALL METAL PIPE IS: (inches) 


36 


18 


12 


9 


6 


Allowable clearances with specified protection (inches) 


Use Column 1 for clearances above appliance or horizontal connector. Use Column 2 
for clearances from appliance, vertical connector and single-wall metal pipe. 


Above 
Col. 1 


Sides 
and 
rear 

Col. 2 


Above 
Col. 1 


Sides 
and 
rear 

Col. 2 


Above 
Col. 1 


Sides 
and 
rear 

Col. 2 


Above 
Col. 1 


Sides 
and 
rear 

Col. 2 


Above 
Col. 1 


Sides 
and 
rear 

Col. 2 


1. S'/^-inch-thick masonry wall without ventilated airspace 


— 


24 


— 


12 


— 


9 


— 


6 


— 


5 


2. Vj-inch insulation board over 1-inch glass fiber or 
mineral wool batts 


24 


18 


12 


9 


9 


6 


6 


5 


4 


3 


3. 0.024 inch sheet metal over 1-inch glass fiber or mineral 
wool batts reinforced with wire on rear face with 
ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


4. S'/^-inch-thick masonry wall with ventilated airspace 





12 


— 


6 


— 


6 





6 





6 


5. 0.024 inch sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


2 


6. Vj-inch-thick insulation board with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


7. 0.024 inch sheet metal with ventilated airspace over 
0.024 inch sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


8. 1-inch glass fiber or mineral wool batts sandwiched 
between two sheets 0.024 inch sheet metal with 
ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 



For SI: 1 inch = 25.4 mm, °C = [(°F - 32)/1.8], 1 pound per cubic foot = 16.02 kg/m?, 1 Btu per inch per square foot per hour per °F = 0.144 W/rr? • K. 

a. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and rehef, and accessibility of servicing. 

b. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any interven- 
ing protection applied to the combustible material. 

c. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector 

d. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures 308.2(2) and 
308.2(3)]. 

e. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace. 

f. Where a wall protector is mounted on a single flat wall away from comers, it shall have a minimum 1 -inch air gap. To provide air circulation, the bottom and top 
edges, or only the side and top edges, or all edges shall be left open. 

g. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1500°E 

h. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less, 
i. There shall be at least 1 inch between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced 

below that allowed in this table, 
j. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable, 
k. Listed single-wall connectors shall be installed in accordance with the terms of their listing and the manufecturer's instructions. 



22 



FUEL GAS CODE OF NEW YORK STATE 



GENERAL REGULATBONS 



3®83.1 Eqenprneet mstalkdl m rooms that are large m 
comparisoE wntlh the size of the eqmpmeinit« Air-condi- 
tioning equipment installed in rooms that are large in com- 
parison with the size of the equipment shall be installed with 
clearances in accordance with the terms of their listing and 
the manufacturer's instructions. 

3CD8.3.2 Eqiiuiipmemt iinistalledl in rooms that are mot large 
im comparnsom with the ske of the eqelpmeet. Air-condi- 
tioning equipment installed in rooms that are not large in 
comparison with the size of the equipment, such as alcoves 
and closets, shall be listed for such installations and in- 



CONSTRUCTION USING COMBUSTIBLE - 
MATERIAL, PLASTERED OR UNPLASTERED 




SHEET METAL 
OR OTHER 
PROTECTION 



1-INCH MINIMUM 
AIRSPACE BETWEEN 
MASONRY AND 
COMBUSTIBLE WALL 



BOnOM AND TOP COURSE 
OF BRICKS STAGGERED 
FOR VENTILATION 



NOTE: DO NOT PLACE MASONRY 
WAa TIES DIRECTLY BEHIND 
APPUANCE OR CONNECTOR 



COMBUSTIBLE WALL 




CORRUGATED 
METAL WALL 
TIES 



"A" equals the reduced clearance with no protection. 

"B" equals the reduced clearance permitted in accordance with Table 308.2. 
The protection applied to the construction using combustible material shall 
extend far enough in each direction to make "C" equal to "A." 

FIGURE 308.2(11) 
EXTENT OF PROTECTDON NECESSARY TO 

S FROM GAS EQUJPIMIENT OR 
VENT CONNECTIONS 



For SI: 1 inch = 25.4 mm. 



IE 308.2(3) 
mSONRY CLEARANCE REDUCTDON SYSTESI 




WALL PROTECTOR MOUNTED 
WITH ALL EDGES OPEN 





— MOUNTED WITH SIDE 
AND TOP EDGES OPEN 



MOUNTED WITH TOP 
AND BOTTOM EDGES 
OPEN 



WALL PROTECTOR MOUNTED 
ON SINGLE FLAT WALL 



MUST BE MOUNTED 
WITH TOP AND BOTTOM 
EDGES OPEN 



WALL PROTECTOR INSTALLED 
IN CORNER 



For SI: 1 inch = 25.4 mm. 



-^ 



COMBUSTIBLE 
WALL 






-^^ 



rNAIL OR SCREW 
ANCHOR 



- CLEARANCE 
REDUCTION SYSTEM 



1-INCH NONCOMBUSTIBLE SPACER SUCH AS STACKED WASHERS, SMALL- 
DIAMETER PIPE, TUBING OR ELECTRICAL CONDUIT. 



MASONRY WALLS CAN BE ATTACHED TO COMBUSTIBLE WALLS USING WALL TIES. 
DO NOT USE SPACERS DIRECTLY BEHIND APPLIANCE OR CONNECTOR. 



FIGURE 308.2(2) 
ECTOR CLEARANCE RE 



SYSTEM 



FUEL GAS CODE OF NEW YORK STATE 



23 



GENERAL REGULAT80NS 



Stalled in accordance with the manufacturer's instructions. 
Listed clearances shall not be reduced by the protection 
methods described in Table 308.2, regardless of whether the 
enclosure is of combustible or noncombustible material. 

308.3.3 ClearaMce redection. Air-conditioning equipment 
installed in rooms that are large in comparison with the size 
of the equipment shall be permitted to be installed with re- 
duced clearances to combustible material provided the com- 
bustible material or equipment is protected as described in 
Table 308.2. 



5.3.4 Plenum clearaeces. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the clearance shall be 
measured to the surface of the plaster or other 
noncombustible finish where the clearance specified is 2 
inches (51 mm) or less. 



Air-conditioning 
equipment shall have the clearance from supply ducts 
within 3 feet (914 mm) of the furnace plenum be not less 
than that specified from the furnace plenum. No clearance is 
necessary beyond this distance. 

308.4 Central-heating tooilers and furnaces. Clearance re- 
quirements for central-heating boilers and furnaces shall com- 
ply with Sections 308.4.1 through 308.4.6. The clearance to 
this equipment shall not interfere with combustion air, draft 
hood clearance and relief, and accessibility for servicing. 

308.4.1 Equipment iestailed in rooms that are large in 
comparison with the size of the equipment. Central-heat- 
ing furnaces and low-pressure boilers installed in rooms 
large in comparison with the size of the equipment shall be 
installed with clearances in accordance with the terms of 
their listing and the manufacturer's instructions. 

308.4.2 Equipment installed in rooms that are not large in 
comparison with the size of the equipment. Central-heat- 
ing furnaces and low-pressure boilers installed in rooms that 
are not large in comparison with the size of the equipment, 
such as alcoves and closets, shall be listed for such installa- 
tions. Listed clearances shall not be reduced by the protection 
methods described in Table 308.2 and illustrated in Figures 
308.2(1) through 308.2(3), regardless of whether the enclo- 
sure is of combustible or noncombustible material. 



308.4,3 Clearance reduction. Central-heating furnaces 
and low-pressure boilers installed in rooms that are large in 
comparison with the size of the equipment shall be permit- 
ted to be installed with reduced clearances to combustible 
material provided the combustible material or equipment is 
protected as described in Table 308.2. 



L4.4 Clearance for servicing equipment. Front clear- 
ance shall be sufficient for servicing the burner and the fur- 
nace or boiler. 



L4.5 Plenum clearances. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the clearance shall be 
measured to the surface of the plaster or other 
noncombustible finish where the clearance specified is 2 
inches (51 mm) or less. 



308.4.6 Clearance from supply ducts. Central-heating 
furnaces shall have the clearance from supply ducts within 3 
feet (914 mm) of the furnace plenum be not less than that 
specified from the furnace plenum. No clearance is neces- 
sary beyond this distance. 



SECTION 309 



,1 Grounding, Gas piping shall not be used as a grounding 



electrode. 



,2 Connections. Electrical connections between equip- 
ment and the building wiring, including the grounding of the 
equipment, shall conform to Chapter 27 of the Building Code 
of New York State. 



SECT!ON310(!FGS) 
ELECTRICAL BONDING 

LI Gas pipe bonding. Each above-ground portion of a gas 
piping system shall be electrically continuous and bonded to an 
effective ground- fault current path in accordance with Chapter 
27 of the Building Code of New York State. Gas piping shall be 
considered to be bonded where it is connected to gas utilization 
equipment that is connected to the equipment grounding con- 
ductor of the circuit supplying that equipment. 



24 



FUEL GAS CODE OF NEW YORK STATE 



FBI 



m DMSmLLATE 



.1 Scope. This chapter shall govern the design, installation, 
modification and maintenance of piping systems. The applica- 
bility of this code to piping systems extends from the point of 
delivery to the connections with the equipment and includes the 
design, materials, components, fabrication, assembly, installa- 
tion, testing, inspection, operation and maintenance of such 
piping systems. 

4fD>lolol UMlDty pSpimg systems located wMIhm bmnMnegs. 
Utility service piping located within buildings shall be in- 
stalled in accordance with the structural safety provisions in 
Section 302 of this code and fire protection provisions of the 
Building Code of New York State. 



4(0)1.2 LiqinelSedl petroleem gas storage. The storage system 
for liquefied petroleum gas shall be designed and installed in 
accordance with the Fire Code of New York State and NFPA 58. 



systems. In modifying or 
adding to existing piping systems, sizes shall be maintained in 
accordance with this chapter. 



Mamces. Where an addidonal appliance 
is to be served, the existing piping shall be checked to deter- 
mine if it has adequate capacity for all appliances served. If in- 
adequate, the existing system shall be enlarged as required or 
separate piping of adequate capacity shall be provided. 



For other than black steel pipe, exposed 
piping shall be identified by a yellow label marked "Gas" in 
black letters. The marking shall be spaced at intervals not ex- 
ceeding 5 feet (1524 mm). The marking shall not be required 
on pipe located in the same room as the equipment served. 



Where two or more meters are in- 
stalled on the same premises but supply separate consumers, 
the piping systems shall not be interconnected on the outlet side 
of the meters. 



401.7 Piplmg meter Meeltfficaitfloini. Piping from multiple me- 
ter installations shall be marked with an approved permanent 
identification by the installer so that the piping system supplied 
by each meter is readily identifiable. 



im sizes. All pipe utilized for the installation, ex- 
tension and alteration of any piping system shall be sized to 
supply the full number of outlets for the intended purpose and 
shall be sized in accordance with Section 402. 



ECTI© 
POPE 



.1 Gemeral comiSEdleraitioinis. Piping systems shall be of 
such size and so installed as to provide a supply of gas sufficient 
to meet the maximum demand without undue loss of pressure 
between the point of delivery and the gas utilization equipment. 



402.2 Maximmm gas demamd. The volume of gas to be pro- 
vided, in cubic feet per hour, shall be determined directly from 
the manufacturer's input ratings of the gas utilization equip- 
ment served. Where an input rating is not indicated, the gas 
supplier, equipment manufacturer or a qualified agency shall 
be contacted, or the rating from Table 402.2 shall be used for D 
estimating the volume of gas to be supplied. 

The total connected hourly load shall be used as the basis for 
pipe sizing, assuming that all equipment could be operating at full 
capacity simultaneously. Where a diversity of load can be estab- 
lished, pipe sizing shall be permitted to be based on such loads. 



TABLE 402.2 
APPROXIMATE GAS INPUT WOU TYPICAL APPLDAWCES 


APPLIANCE 


INPUT BTU/H 
(ApproK.) 


Space Meatning Units 




Hydronic boiler 




Single-family 


100,000 


Multifamily, per unit 


60,000 


Warm-air furnace 




Single-family 


100,000 


Multifamily, per unit 


60,000 


Space and Walter Heating Units 




Hydronic boiler 




Single-family 


120,000 


Multifamily, per unit 


75,000 


Water Heating Appliances 




Water heater, automatic instantaneous 




Capacity at 2 gal./minute 


142,800 


Capacity at 4 gal./minute 


285,000 


Capacity at 6 gal./minute 


428,400 


Water heater, automatic storage, 30- to 40-gal. tank 


35,000 


Water heater, automatic storage, 50-gal. tank 


50,000 


Water heater, domestic, circulating or side-arm 


35,000 


Cooidng Appliances 




Built-in oven or broiler unit, domestic 


25,000 


Built-in top unit, domestic 


40,000 


Range, free-standing, domestic 


65,000 


Other Appliances 




Barbecue 


40,000 


Clothes dryer, Type 1 (domestic) 


35,000 


Gas fireplace, direct-vent 


40,000 


Gas light 


2,500 


Gas log 


80,000 


Refrigerator 


3,000 



For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L, 
1 gallon per minute = 3.785 L/m. 



FUEL OAS CODE OF NEW YORK STATE 



25 



GAS PIPING INSTALLATIONS 



402.3 Sizing. Gas piping shall be sized in accordance with one 
of the following: 

1 . Pipe sizing tables or sizing equations in accordance with 
Section 402.4. 

2. The sizing tables included in a listed piping system's 
manufacturer's installation instructions. 

3. Other approved engineering methods. 

402.4 Sizing tables and equations. Where Tables 402.4(1) 
through 402.4(33) are used to size piping or tubing, the pipe 
length shall be determined in accordance with Section 402.4. 1 , 
402.4.2 or 402.4.3. 

Where Equations 4-1 and 4-2 are used to size piping or tub- 
ing, the pipe or tubing shall have smooth inside walls and the 
pipe length shall be determined in accordance with Section 
402.4.1, 402.4.2 or 402.4.3. 

1. Low-pressure gas equation [Less than 1.5 pounds per 
square inch (psi) (10.3 kPa)]: 

g0.381 

D = — (Equation 4-1) 



12.4.2 Branch length method. Pipe shall be sized as fol- 



19.17 



AH 

C- f X. Li I 



0.206 



2. High-pressure gas equation [1.5 psi (10.3 kPa) and 
above]: 

^0.381 

D = r-^- (Equation 4-2) 



18.93 



P\-P2 



n 0.206 



xY 



CfXL 



where: 

D = Inside diameter of pipe, inches (mm). 

Q = Input rate appliance(s), cubic feet per hour at 60°F 
(16°C) and 30-inch mercury column 

P, = Upstream pressure, psia (P^ + 14.7) 

P2 = Downstream pressure, psia (^2 + 14.7) 

L = Equivalent length of pipe, feet 

AH = Pressure drop, inch water column (27.7 inch water col- 
umn = 1 psi) 



TABLE 402.4 

Cr AND LVALUES FOR NATURAL GAS AND 

UNDILUTED PROPANE AT STANDARD CONDITIONS 



GAS 


EQUATION FACTORS 


Cr 


V 


Natural gas 


0.6094 


0.9992 


Undiluted propane 


1.2462 


0.9910 



For SI: 1 cubic foot = 0.028 m^, 1 foot = 305 mm, 1-inch water column - 
0.249 kPa, 1 pound per square inch - 6.895 kPa, 1 British thermal 
unit per hour = 0.293 W. 

402.4.1 Longest length method. The pipe size of each sec- 
tion of gas piping shall be determined using the longest 
length of piping from the point of delivery to the most re- 
mote outlet and the load of the section. 



lows: 



1 . Pipe size of each section of the longest pipe run from 
the point of delivery to the most remote outlet shall be 
determined using the longest run of piping and the 
load of the section. 

2. The pipe size of each section of branch piping not pre- 
viously sized shall be determined using the length of 
piping from the point of delivery to the most remote 
outlet in each branch and the load of the section. 



pressure. The pipe size for each section of 
higher pressure gas piping shall be determined using the 
longest length of piping from the point of delivery to the 
most remote line pressure regulator. The pipe size from the 
line pressure regulator to each outlet shall be determined us- 
ing the length of piping from the regulator to the most re- 
mote outlet served by the regulator. 

402.5 Allowable pressure drop. The design pressure loss in 
any piping system under maximum probable flow conditions, 
from the point of delivery to the inlet connection of the equip- 
ment, shall be such that the supply pressure at the equipment is 
greater than the minimum pressure required for proper equip- 
ment operation. 

402.6 Maximum design operating pressure. The maximum 
design operating pressure for piping systems located inside 
buildings shall not exceed 5 pounds per square inch gauge 
(psig) (34 kPa gauge) except where one or more of the follow- 
ing conditions are met: 

1 . The piping system is welded. 

2. The piping is located in a ventilated chase or otherwise 
enclosed for protection against accidental gas accumula- 
tion. 

3 . The piping is located inside buildings or separate areas of 
buildings used exclusively for: 

3.1. Industrial processing or heating; 

3.2. Research; 

3.3. Warehousing; or 

3.4. Boiler or mechanical equipment rooms. 

4. The piping is a temporary installation for buildings under 
construction. 



.1 Liquefied petroleum gas systems. The operating 
pressure for undiluted LP-gas systems shall not exceed 20 
psig (140 kPa gauge). Buildings having systems designed to 
operate below -5°F (-21°C) or with butane or a propane-bu- 
tane mix shall be designed to either accommodate liquid 
LP-gas or prevent LP-gas vapor from condensing into a liq- 
uid. 

Exception: Buildings or separate areas of buildings con- 
structed in accordance with Chapter 7 of NFPA 58, and 
used exclusively to house industrial processes, research 
and experimental laboratories, or equipment or process- 
ing having similar hazards. 



26 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(1) 
IIEDULE 40 METALLIC PDPE 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


0.3 inch WC 


Specific Gravity 


0.60 



PIPE SIZE (in.) 


Nominal 


•/4 


% 


72 


% 


1 


l'/4 


l'/2 


2 


2'/2 


3 


4 


Actual ID 


0.364 


0.493 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


32 


72 


132 


278 


520 


1,050 


1,600 


3,050 


4,800 


8,500 


17,500 


20 


22 


49 


92 


190 


350 


730 


1,100 


2,100 


3,300 


5,900 


12,000 


30 


18 


40 


73 


152 


285 


590 


890 


1,650 


2,700 


4,700 


9,700 


40 


15 


34 


63 


130 


245 


500 


760 


1,450 


2,300 


4,100 


8,300 


50 


14 


30 


56 


115 


215 


440 


670 


1,270 


2,000 


3,600 


7,400 


60 


12 


27 


50 


105 


195 


400 


610 


1,150 


1,850 


3,250 


6,800 


70 


11 


25 


46 


96 


180 


370 


560 


1,050 


1,700 


3,000 


6,200 


80 


11 


23 


43 


90 


170 


350 


530 


990 


1,600 


2,800 


5,800 


90 


10 


22 


40 


84 


160 


320 


490 


930 


1,500 


2,600 


5,400 


100 


9 


21 


38 


79 


150 


305 


460 


870 


1,400 


2,500 


5,100 


125 


8 


18 


34 


72 


130 


275 


410 


780 


1,250 


2,200 


4,500 


150 


8 


17 


31 


64 


120 


250 


380 


710 


1,130 


2,000 


4,100 


175 


7 


15 


28 


59 


110 


225 


350 


650 


1,050 


1,850 


3,800 


200 


6 


14 


26 


55 


100 


210 


320 


610 


980 


1,700 


3,500 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour - 0.0283 rrf/h, 1 pound per square inch = 6.895 icPa, 1-inch water column = 0.2488 kPa. 



TABLE 402.4(2) 
SCHEDULE 40 iVJETALLDC PDPE 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


0.60 



PIPE SIZE (in.) 


[Nominal 


'/4 


% 


'/2 


'U 


1 


l'/4 


l'/2 


2 


2V2 


3 


4 


Actual ID 


0.364 


0.493 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


iVlaximum Capacity in Cubic Feet of Gas per Hour 


10 


43 


95 


175 


360 


680 


1,400 


2,100 


3,950 


6,300 


11,000 


23,000 


20 


29 


65 


120 


250 


465 


950 


1,460 


2,750 


4,350 


7,700 


15,800 


30 


24 


52 


97 


200 


375 


770 


1,180 


2,200 


3,520 


6,250 


12,800 


40 


20 


45 


82 


170 


320 


660 


990 


1,900 


3,000 


5,300 


10,900 


50 


18 


40 


73 


151 


285 


580 


900 


1,680 


2,650 


4,750 


9,700 


60 


16 


36 


66 


138 


260 


530 


810 


1,520 


2,400 


4,300 


8,800 


70 


15 


33 


61 


125 


240 


490 


750 


1,400 


2,250 


3,900 


8,100 


80 


14 


31 


57 


118 


220 


460 


690 


1,300 


2,050 


3,700 


7,500 


90 


13 


29 


53 


110 


205 


430 


650 


1,220 


1,950 


3,450 


7,200 


100 


12 


27 


50 


103 


195 


400 


620 


1,150 


1,850 


3,250 


6,700 


125 


11 


24 


44 


93 


175 


360 


550 


1,020 


1,650 


2,950 


6,000 


150 


10 


22 


40 


84 


160 


325 


500 


950 


1,500 


2,650 


5,500 


175 


9 


20 


37 


11 


145 


300 


460 


850 


1,370 


2,450 


5,000 


200 


8 


19 


35 


11 


135 


280 


430 


800 


1,280 


2,280 


4,600 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rrf/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 



FUEL GAS CODE OF MEW YORK STATE 



27 



GAS PBPING INSTALLATIONS 



TABLE 402.4(3) 
SCHEDULE 40 METALLIC PIPE 



Gas 


Natural 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


0.60 



PIPE SIZE (in.) 


Nominal 


'/2 


'U 


1 


l'/4 


l'/2 


2 


2'/2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


1,506 


3,041 


5,561 


11,415 


17,106 


32,944 


52,505 


92,819 


189,326 


20 


1,065 


2,150 


3,932 


8,072 


12,096 


23,295 


37,127 


65,633 


133,873 


30 


869 


1,756 


3,211 


6,591 


9,876 


19,020 


30,314 


53,589 


109,307 


40 


753 


1,521 


2,781 


5,708 


8,553 


16,472 


26,253 


46,410 


94,663 


50 


673 


1,360 


2,487 


5,105 


7,650 


14,733 


23,481 


41,510 


84,669 


60 


615 


1,241 


2,270 


4,660 


6,983 


13,449 


21,435 


37,893 


77,292 


70 


569 


1,150 


2,102 


4,315 


6,465 


12,452 


19,845 


35,082 


71,558 


80 


532 


1,075 


1,966 


4,036 


6,048 


11,647 


18,563 


32,817 


66,937 


90 


502 


1,014 


1,854 


3,805 


5,702 


10,981 


17,502 


30,940 


63,109 


100 


462 


934 


1,708 


3,508 


5,257 


10,125 


16,138 


28,530 


58,194 


125 


414 


836 


1,528 


3,138 


4,702 


9,056 


14,434 


25,518 


52,050 


150 


372 


751 


1,373 


2,817 


4,222 


8,130 


12,960 


22,911 


46,732 


175 


344 


695 


1,271 


2,608 


3,909 


7,527 


11,999 


21,211 


43,265 


200 


318 


642 


1,174 


2,413 


3,613 


6,959 


11,093 


19,608 


39,997 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rr?/h, 1 pound per square inch = 6.895 kPa. 



TABLE 402.4(4) 

SCHEDULE 40 METALLIC PIPE 



Gas 


Natural 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 


Specific Gravity 


0.60 



PIPE SIZE (in.) 


Nominal 


'/2 


'U 


1 


IV4 


l'/2 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


3,185 


6,434 


11,766 


24,161 


36,206 


69,727 


111,133 


196,468 


400,732 


20 


2,252 


4,550 


8,320 


17,084 


25,602 


49,305 


78,583 


138,924 


283,361 


30 


1,839 


3,715 


6,793 


13,949 


20,904 


40,257 


64,162 


113,431 


231,363 


40 


1,593 


3,217 


5,883 


12,080 


18,103 


34,864 


55,566 


98,234 


200,366 


50 


1,425 


2,878 


5,262 


10,805 


16,192 


31,183 


49,700 


87,863 


179,213 


60 


1,301 


2,627 


4,804 


9,864 


14,781 


28,466 


45,370 


80,208 


163,598 


70 


1,204 


2,432 


4,447 


9,132 


13,685 


26,354 


42,004 


74,258 


151,463 


80 


1,153 


2,330 


4,260 


8,542 


12,801 


24,652 


39,291 


69,462 


141,680 


90 


1,062 


2,145 


3,922 


8,054 


12,069 


23,242 


37,044 


65,489 


133,577 


J 00 


979 


1,978 


3,617 


7,427 


11,128 


21,433 


34,159 


60,387 


123,173 


125 


876 


1,769 


3,235 


6,643 


9,953 


19,170 


30,553 


54,012 


110,169 


150 


786 


1,589 


2,905 


5,964 


8,937 


17,211 


27,431 


48,494 


98,911 


175 


728 


1,471 


2,690 


5,522 


8,274 


15,934 


25,396 


44,897 


91,574 


200 


673 


1,360 


2,487 


5,104 


7,649 


14,729 


23,478 


41,504 


84,656 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 ni'/h, 1 pound per square inch = 6.895 icPa. 



28 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(5) 
JHEDULE 40 METALUC PIPE 



Gas 


Natural 


Dniet Pressure 


1.0 psi or less 


Pressure Drop 


0.3 inch WC 


Specific Gravity 


0.60 



PIPE SIZE (in.) 


Nominal 


1 


IV4 


IV, 


2 


2'/, 


3 


3V, 


4 


5 


6 


8 


10 


12 


Actual ID 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


3.548 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 










Maximum Capacity 


in Cubic Feet of Gas 


per Hour 










50 


215 


442 


662 


1,275 


2,033 


3,594 


5,262 


7,330 


13,261 


21,472 
14,758 


44,118 


80,130 


126,855 


100 


148 


304 


455 


877 


1,397 


2,470 


3,616 


5,038 


9,114 


30,322 


55,073 


87,187 


150 


119 


244 


366 


704 


1,122 


1,983 


2,904 


4,046 


7,319 


11,851 


24,350 


44,225 


70,014 


200 


102 


209 


313 


602 


960 


1,698 


2,485 


3,462 


6,264 


10,143 


20,840 


37,851 


59,923 


250 


90 


185 


277 


534 


851 


1,505 


2,203 


3,069 


5,552 


8,990 


18,470 


33,547 


53,109 


300 


82 


168 


251 


484 


771 


1,363 


1,996 


2,780 


5,030 


8,145 


16,735 


30,396 


48,120 


400 


70 


143 


215 


414 


660 


1,167 


1,708 


2,380 


4,305 


6,971 


14,323 


26,015 


41,185 


500 


62 


127 


191 


367 


585 


1,034 


1,514 


2,109 


3,816 


6,178 


12,694 


23,056 


36,501 


1,000 


43 


87 


131 


252 


402 


711 


1,041 


1,450 


2,623 


4,246 


8,725 


15,847 


25,087 


1,500 


34 


70 


105 


203 


323 


571 


836 


1,164 


2,106 


3,410 


7,006 


12,725 


20,146 


2,000 


29 


60 


90 


173 


276 


488 


715 


996 


1,802 


2,919 


5,997 


10,891 


17,242 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 n:i?/ii, 1 pound per square inch = 6.895 icPa, 1-inch water column = 0.2488 kPa. 



TABLE 402.4(6) 



Gas 


Natural 


Inlet Pressure 


1.0 psi or less 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


0.60 



PDPE SIZE (in.) 


Nominal 


1 


IV4 


IV, 


2 


2V, 


3 


3V, 


4 


5 


6 


8 


10 


12 


Actual ID 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


3.548 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


50 


284 


583 


873 


1,681 


2,680 


4,738 


6,937 


9,663 


17,482 


28,308 


58,161 


105,636 


167,236 


100 


195 


400 


600 


1,156 


1,842 


3,256 


4,767 


6,641 


12,015 


19,456 


39,974 


72,603 


114,940 


150 


157 


322 


482 


928 


1,479 


2,615 


3,828 


5,333 


9,649 


15,624 


32,100 


58,303 


92,301 


200 


134 


275 


An 


794 


1,266 


2,238 


3,277 


4,565 


8,258 


13,372 


27,474 


49,900 


78,998 


250 


119 


244 


366 


704 


1,122 


1,983 


2,904 


4,046 


7,319 


11,851 


24,350 


44,225 


70,014 


300 


108 


221 


331 


638 


1,017 


1,797 


2,631 


3,666 


6,632 


10,738 


22,062 


40,071 


63,438 


400 


92 


189 


283 


546 


870 


1,538 


2,252 


3,137 


5,676 


9,190 


18,883 


34,296 


54,295 


500 


82 


168 


251 


484 


771 


1,363 


1,996 


2,780 


5,030 


8,145 


16,735 


30,396 


48,120 


1,000 


56 


115 


173 


333 


530 


937 


1,372 


1,911 


3,457 


5,598 


11,502 


20,891 


33,073 


1,500 


45 


93 


139 


267 


426 


752 


1,102 


1,535 


2,776 


4,496 


9,237 


16,776 


26,559 


2,000 


39 


79 


119 


229 


364 


644 


943 


1,313 


2,376 


3,848 


7,905 


14,358 


22,731 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 n^/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 



FUEL GAS CODE OF MEW YORK STATE 



29 



GAS PIPING INSTALLATIONS 



TABLE 402.4(7) 
SEMI-RIGID COPPER TUBING 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


0.3 inch WC 


Specific Gravity 


0.60 







TUBE SIZE (in.) 


Nominal 


K&L 


V. 


\ 


V, 


% 


\ 


1 


vu 


IV, 


2 


2V, 


ACR 


\ 


% 


% 


'U 


y. 


1% 


1% 


1V« 


2% 


2^/« 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


20 


42 


85 


148 


210 


448 


806 


1,271 


2,646 


4,682 


20 


14 


29 


58 


102 


144 


308 


554 


873 


1,819 


3,218 


30 


11 


23 


47 


82 


116 


247 


445 


701 


1,461 


2,584 


40 


10 


20 


40 


70 


99 


211 


381 


600 


1,250 


2,212 


50 


8.4 


17 


35 


62 


88 


187 


337 


532 


1,108 


1,960 


60 


7.6 


16 


32 


56 


79 


170 


306 


482 


1,004 


1,776 


70 


7.0 


14 


29 


52 


73 


156 


281 


443 


924 


1,634 


80 


6.5 


13 


27 


48 


68 


145 


262 


413 


859 


1,520 


90 


6.1 


13 


26 


45 


64 


136 


245 


387 


806 


1,426 


100 


5.8 


12 


24 


43 


60 


129 


232 


366 


761 


1,347 


125 


5.1 


11 


22 


38 


53 


114 


206 


324 


675 


1,194 


150 


4.7 


10 


20 


34 


48 


103 


186 


294 


612 


1,082 


175 


4.3 


8.8 


18 


31 


45 


95 


171 


270 


563 


995 


200 


4.0 


8.2 


17 


29 


41 


89 


159 


251 


523 


926 


250 


3.5 


7.3 


15 


26 


37 


78 


141 


223 


464 


821 


300 


3.2 


6.6 


13 


23 


33 


71 


128 


202 


420 


744 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rr?/h, 1 pound per square inch = 6.895 kPa, 1-inch water column - 0.2488 kPa. 
NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



30 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(8) 
SEMDRnGIlD COPPER TOBDBVIG 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


0.60 







TUBE SIZE (in.) 


Nominal 


KaL 


V4 


\ 


V, 


V« 


y. 


1 


IV4 


1% 


2 


2'/, 


ACR 


% 


% 


% 


V. 


% 


1% 


1V« 


l\ 


2% 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


[nside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


n/laxDmum Capacity in Cubic Feet of Gas per Hour 


10 


27 


55 


111 


195 


276 


590 


1,062 


1,675 


3,489 


6,173 


20 


18 


38 


77 


134 


190 


406 


730 


1,151 


2,398 


4,242 


30 


15 


30 


61 


107 


152 


326 


586 


925 


1,926 


3,407 


40 


13 


26 


53 


92 


131 


279 


502 


791 


1,648 


2,916 


50 


11 


23 


47 


82 


116 


247 


445 


701 


1,461 


2,584 


60 


10 


21 


42 


74 


105 


224 


403 


635 


1,323 


2,341 


70 


9.3 


19 


39 


68 


96 


206 


371 


585 


1,218 


2,154 


80 


8.6 


18 


36 


63 


90 


192 


345 


544 


1,133 


2,004 


90 


8.1 


17 


34 


59 


84 


180 


324 


510 


1,063 


1,880 


100 


7.6 


16 


32 


56 


79 


170 


306 


482 


1,004 


1,776 


125 


6.8 


14 


28 


50 


70 


151 


271 


427 


890 


1,574 


150 


6.1 


13 


26 


45 


64 


136 


245 


387 


806 


1,426 


175 


5.6 


12 


24 


41 


59 


125 


226 


356 


742 


1,312 


200 


5.2 


11 


22 


39 


55 


117 


210 


331 


690 


1,221 


250 


4.7 


10 


20 


34 


48 


103 


186 


294 


612 


1,082 


300 


4.2 


8.7 


18 


31 


44 


94 


169 


266 


554 


980 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 n?/h, 1 pound per square inch = 6.895 kPa, l-inch water column - 0.2488 kPa. 
NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



FUEL GAS CODE OF NEW Y0R5C STATE 



31 



GAS PIPING INSTALLATIONS 



TABLE 402.4(9) 

SEMIRIGID COPPER TUBING 

Use this Table to Size Tubing from House Line Regulator to the Appliance. 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


1.0 inch WC 


Specific Gravity 


0.60 







TUBE SIZE (in.) 


IvSominal 


K&L 


'/4 


% 


'/, 


% 


'U 


1 


IV. 


1% 


2 


2'/, 


ACR 


\ 


'/, 


v« 


\ 


% 


1V« 


y\ 


1% 


2V« 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


39 


80 


162 


283 


402 


859 


1,546 


2,437 


5,076 


8,981 


20 


27 


55 


ill 


195 


276 


590 


1,062 


1,675 


3,489 


6,173 


30 


21 


44 


89 


156 


222 


474 


853 


1,345 


2,802 


4,957 


40 


18 


38 


77 


134 


190 


406 


730 


1,151 


2,398 


4,242 


50 


16 


33 


68 


119 


168 


359 


647 


1,020 


2,125 


3,760 


60 


15 


30 


61 


107 


152 


326 


586 


925 


1,926 


3,407 


70 


13 


28 


57 


99 


140 


300 


539 


851 


1,772 


3,134 


80 


13 


26 


53 


92 


131 


279 


502 


791 


1,648 


2,916 


90 


12 


24 


49 


86 


122 


262 


471 


742 


1,546 


2,736 


100 


11 


23 


47 


82 


116 


247 


445 


701 


1,461 


2,584 


125 


9.8 


20 


41 


72 


103 


219 


394 


622 


1,295 


2,290 


150 


8.9 


18 


37 


65 


93 


198 


357 


563 


1,173 


2,075 


175 


8.2 


17 


34 


60 


85 


183 


329 


518 


1,079 


1,909 


200 


7.6 


16 


32 


56 


79 


170 


306 


482 


1,004 


1,776 


250 


6.8 


14 


28 


50 


70 


151 


271 


427 


890 


1,574 


300 


6.1 


13 


26 


45 


64 


136 


245 


387 


806 


1,426 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rr?/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 
NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



32 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(110) 
sEMSRDGDD COPPEIR TUBING 



Gas 


Natural 


Inlet Pressure 


2.0 psi or less 


Pressure Drop 


17.0 inch WC 


Specific Gravity 


0.60 





TUBE SIZE (in.) 


Nominal 


KaL 


V4 


\ 


% 


% 


'U 


1 


IV. 


IV, 


2 


2V, 


ACR 


\ 


% 


% 


'U 


'U 


l'/« 


l\ 


\% 


2V« 


2\ 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


190 


391 


796 


1,391 


1,974 


4,216 


7,591 


11,968 


24,926 


44,100 


20 


130 


269 


547 


956 


1,357 


2,898 


5,217 


8,226 


17,132 


30,310 


30 


105 


216 


439 


768 


1,089 


2,327 


4,189 


6,605 


13,757 


24,340 


40 


90 


185 


376 


657 


932 


1,992 


3,586 


5,653 


11,775 


20,832 


50 


79 


164 


333 


582 


826 


1,765 


3,178 


5,010 


10,436 


18,463 


60 


72 


148 


302 


528 


749 


1,599 


2,879 


4,540 


9,455 


16,729 


70 


66 


137 


278 


486 


689 


1,471 


2,649 


4,177 


8,699 


15,390 


80 


62 


127 


258 


452 


641 


1,369 


2,464 


3,886 


8,093 


14,318 


90 


58 


119 


243 


424 


601 


1,284 


2,312 


3,646 


7,593 


13,434 


100 


55 


113 


229 


400 


568 


1,213 


2,184 


3,444 


7,172 


12,689 


125 


48 


100 


203 


355 


503 


1,075 


1,936 


3,052 


6,357 


11,246 


150 


44 


90 


184 


321 


456 


974 


1,754 


2,765 


5,760 


10,190 


175 


40 


83 


169 


296 


420 


896 


1,614 


2,544 


5,299 


9,375 


200 


38 


11 


157 


275 


390 


834 


1,501 


2,367 


4,930 


8,721 


250 


33 


69 


140 


244 


346 


739 


1,330 


2,098 


4,369 


7,730 


300 


30 


62 


126 


221 


313 


670 


1,205 


1,901 


3,959 


7,004 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 irP/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 
Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



FUEL GAS CODE OF NEW YORK STATE 



33 



GAS PIPING INSTALLATIONS 



TABLE 402.4(11) 
SEMIRIGID COPPER TUBING 



Gas 


Natural 


Inlet Pressure 


2.0 psi or less 


Pressure Drop 


1.0 psi 


Specific Gravity 


0.60 







TUBE SIZE (In.) 


Nominal 


K&L 


% 


\ 


% 


% 


\ 


1 


iv. 


iv. 


2 


2% 


ACR 


\ 


% 


% 


'U 


y. 


l'/« 


1% 


1% 


2V« 


2\ 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity In Cubic Feet of Gas per Hour 




10 


245 


506 


1,030 


1,800 


2,554 


5,455 


9,820 


15,483 


32,247 


57,051 


20 


169 


348 


708 


1,237 


1,755 


3,749 


6,749 


10,641 


22,163 


39,211 


30 


135 


279 


568 


993 


1,409 


3,011 


5,420 


8,545 


17,798 


31,488 


40 


116 


239 


486 


850 


1,206 


2,577 


4,639 


7,314 


15,232 


26,949 


50 


103 


212 


431 


754 


1,069 


2,284 


4,111 


6,482 


13,500 


23,885 


60 


93 


192 


391 


683 


969 


2,069 


3,725 


5,873 


12,232 


21,641 


70 


86 


177 


359 


628 


891 


1,904 


3,427 


5,403 


11,253 


19,910 


80 


80 


164 


334 


584 


829 


1,771 


3,188 


5,027 


10,469 


18,522 


90 


75 


154 


314 


548 


778 


1,662 


2,991 


4,716 


9,823 


17,379 


100 


71 


146 


296 


518 


735 


1,570 


2,826 


4,455 


9,279 


16,416 


125 


63 


129 


263 


459 


651 


1,391 


2,504 


3,948 


8,223 


14,549 


150 


57 


117 


238 


416 


590 


1,260 


2,269 


3,577 


7,451 


13,183 


175 


52 


108 


219 


383 


543 


1,160 


2,087 


3,291 


6,855 


12,128 


200 


49 


100 


204 


356 


505 


1,079 


1,942 


3,062 


6,377 


11,283 


250 


43 


89 


181 


315 


448 


956 


1,721 


2,714 


5,652 


10,000 


300 


39 


80 


164 


286 


406 


866 


1,559 


2,459 


5,121 


9,060 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour - 0.0283 iT?/h, 1 pound per square inch = 6.895 kPa. 

NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



34 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPDMG INSTALLATIONS 



Siziog Between PoinS off 
by a Siinglle House Lioe 



402.4(12) 
lOPPER TUBING 

and the Mouse Line Regulator. Total Load 
M Exceediiinig 150 Cubic Feet per Hour: 



Gas 


Natural 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.5 psi 


Specific Gravity 


0.60 







TUBE SIZE (in.) 


Nominal 


K&L 


'/4 


\ 


% 


v« 


'U 


1 


vu 


1% 


2 


2% 


ACR 


\ 


% 


V« 


'U 


% 


1% 


l\ 


iv« 


2% 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside^ 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


iVlaximum Capacity in Cubic Feet of Gas per Hour 




10 


303 


625 


1,272 


2,224 


3,155 


6,739 


12,131 


19,127 


39,837 


70,481 


20 


208 


430 


874 


1,528 


2,168 


4,631 


8,338 


13,146 


27,380 


48,441 


30 


167 


345 


702 


1,227 


1,741 


3,719 


6,696 


10,557 


21,987 


38,900 


40 


143 


295 


601 


1,050 


1,490 


3,183 


5,731 


9,035 


18,818 


33,293 


50 


127 


262 


533 


931 


1,321 


2,821 


5,079 


8,008 


16,678 


29,507 


60 


115 


237 


483 


843 


1,197 


2,556 


4,602 


7,256 


15,112 


26,736 


70 


106 


218 


444 


776 


1,101 


2,352 


4,234 


6,675 


13,903 


24,597 


80 


98 


203 


413 


722 


1,024 


2,188 


3,939 


6,210 


12,934 


22,882 


90 


92 


191 


388 


677 


961 


2,053 


3,695 


5,826 


12,135 


21,470 


100 


87 


180 


366 


640 


908 


1,939 


3,491 


5,504 


11,463 


20,280 


125 


77 


159 


324 


567 


804 


1,718 


3,094 


4,878 


10,159 


17,974 


150 


70 


145 


294 


514 


729 


1,557 


2,803 


4,420 


9,205 


16,286 


175 


64 


133 


270 


473 


671 


1,432 


2,579 


4,066 


8,469 


14,983 


200 


60 


124 


252 


440 


624 


1,333 


2,399 


3,783 


7,878 


13,938 


250 


53 


110 


223 


390 


553 


1,181 


2,126 


3,352 


6,982 


12,353 


300 


48 


99 


202 


353 


501 


1,070 


1,927 


3,038 


6,327 


11,193 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rrf/h, 1 pound per square inch = 6.895 kPa. 



1 . Table capacities are based on Type K copper tubing inside diameter (shown), 

2. When this table is used to size the tubing upstream of a line pressure regulator, 
pressure drop no greater than 1 inch w.c. 



which has the smallest inside diameter of the copper tubing products. 

the pipe or tubing downstream of the line pressure regulator shall be sized using a 



FUEL GAS CODE OF NEW YORK STATE 



35 



GAS PIPING INSTALLATIONS 



TABLE 402.4(13) 
SEMIRIGID COPPER TUBING 



Gas 


Natural 


Inlet Pressure 


5.0 psi or less 


Pressure Drop 


3.5 psi 


Specific Gravity 


0.60 







TUBE SIZE (in.) 


Nominal 


K&L 


V. 


\ 


'/, 


\ 


% 


1 


1'/. 


1% 


2 


2'/, 


ACR 


% 


% 


v« 


'U 


% 


1V« 


l\ 


W 


2V« 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


511 


1,054 


2,144 


3,747 


5,315 


11,354 


20,441 


32,229 


67,125 


118,758 


20 


351 


724 


1,473 


2,575 


3,653 


7,804 


14,049 


22,151 


46,135 


81,622 


30 


282 


582 


1,183 


2,068 


2,934 


6,267 


11,282 


17,788 


37,048 


65,545 


40 


241 


498 


1,013 


1,770 


2,511 


5,364 


9,656 


15,224 


31,708 


56,098 


50 


214 


441 


898 


1,569 


2,225 


4,754 


8,558 


13,493 


28,102 


49,719 


60 


194 


400 


813 


1,421 


2,016 


4,307 


7,754 


12,225 


25,463 


45,049 


70 


178 


368 


748 


1,308 


1,855 


3,962 


7,134 


11,247 


23,425 


41,444 


80 


166 


342 


696 


1,216 


1,726 


3,686 


6,636 


10,463 


21,793 


38,556 


90 


156 


321 


653 


1,141 


1,619 


3,459 


6,111 


9,817 


20,447 


36,176 


100 


147 


303 


617 


1,078 


1,529 


3,267 


5,882 


9,273 


19,315 


34,172 


125 


130 


269 


547 


955 


1,356 


2,896 


5,213 


8,219 


17,118 


30,286 


150 


118 


243 


495 


866 


1,228 


2,624 


4,723 


7,447 


15,510 


27,441 


175 


109 


224 


456 


796 


1,130 


2,414 


4,345 


6,851 


14,269 


25,245 


200 


101 


208 


424 


741 


1,051 


2,245 


4,042 


6,374 


13,275 


23,486 


250 


90 


185 


376 


657 


932 


1,990 


3,583 


5,649 


11,765 


20,815 


300 


81 


167 


340 


595 


844 


1,803 


3,246 


5,118 


10,660 


18,860 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m'/h, 1 pound per square inch = 6.895 kPa. 

NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



36 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPING DMSTALLATDONS 



TABLE 402.4(14) 
sTADNLESS STEEL TUBING (CSST) 



Gas 


Natural 


Dniet Pressure 


0.5 psi or less 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


0.60 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 








Maximum Capacity in Cubic Feet of Gas pet 


Hour 








5 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


4,142 


10 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,261 


2,934 


15 


25 


35 


66 


77 


132 


157 


267 


310 


524 


1,027 


2,398 


20 


22 


31 


58 


67 


116 


137 


231 


269 


456 


888 


2,078 


25 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


1,860 


30 


18 


25 


47 


55 


96 


112 


188 


218 


374 


723 


1,698 


40 


15 


21 


41 


47 


83 


97 


162 


188 


325 


625 


1,472 


50 


13 


19 


37 


42 


75 


87 


144 


168 


292 


559 


1,317 


60 


12 


17 


34 


38 


68 


80 


131 


153 


267 


509 


1,203 


70 


11 


16 


31 


36 


63 


74 


121 


141 


248 


471 


1,114 


80 


10 


15 


29 


33 


60 


69 


113 


132 


232 


440 


1,042 


90 


10 


14 


28 


32 


57 


65 


107 


125 


219 


415 


983 


100 


9 


13 


26 


30 


54 


62 


101 


118 


208 


393 


933 


150 


7 


10 


20 


23 


42 


48 


78 


91 


171 


320 


762 


200 


6 


9 


18 


21 


38 


44 


71 


82 


148 


277 


661 


250 


5 


8 


16 


19 


34 


39 


63 


74 


133 


247 


591 


300 


5 


7 


15 


17 


32 


36 


57 


67 


95 


226 


540 



For SI: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m'/h, 1 pound per square inch = 6.895 kPa, 
1-inch water column = 0.2488 kPa, 1 degree = 0.01745 rad. 

NOTE: Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equiva- 
lent length of tubing to the following equation: L = 1.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



FUEL GAS CODE OF NEW YORK STATE 



37 



GAS PIPING INSTALLATIONS 



TABLE 402.4(15) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 



Gas 


Natural 


Inlet Pressure 


0.5 psi or less 


Pressure Drop 


3.0 inch WC 


Specific Gravity 


0.60 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


5 


120 


160 


277 


327 


529 


649 


1,182 


1,365 


2,141 


4,428 


10,103 


10 


83 


112 


197 


231 


380 


462 


828 


958 


1,528 


3,199 


7,156 


15 


67 


90 


161 


189 


313 


379 


673 


778 


1,254 


2,541 


5,848 


20 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,197 


5,069 


25 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,963 


4,536 


30 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


4,142 


40 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,548 


3,590 


50 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,383 


3,213 


60 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,261 


2,934 


70 


29 


41 


76 


88 


150 


178 


306 


355 


593 


1,166 


2,717 


80 


27 


38 


71 


82 


141 


167 


285 


331 


555 


1,090 


2,543 


90 


26 


36 


67 


77 


133 


157 


268 


311 


524 


1,027 


2,398 


100 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


2,276 


150 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


1,860 


200 


17 


23 


45 


52 


91 


106 


178 


207 


355 


686 


1,612 


250 


15 


21 


40 


46 


82 


95 


159 


184 


319 


613 


1,442 


300 


13 


19 


37 


42 


75 


87 


144 


168 


234 


559 


1,317 



For SI: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m'/h, 1 pound per square inch = 6.895 kPa, 
1-inch water column = 0.2488 kPa, 1 degree = 0.01745 rad. 

NOTE: Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equiva- 
lent length of tubing to the following equation: L = 1 .3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



38 



FUEL GAS CODE OF NEW YORK STATE 



CORRUGATED STADMLESS STEEL TUBliMG (CSST) 



Gas 


Natural 


Onlet Pressure 


0.5 psi or less 


Pressure Drop 


6.0 inch WC 


Specific Gravity 


0.60 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 








iViaximum Capacity in Cubic Feet of Gas per 


Hour 








5 


173 


229 


389 


461 


737 


911 


1,687 


1,946 


3,000 


6,282 


14,263 


10 


120 


160 


277 


327 


529 


649 


1,182 


1,365 


2,141 


4,428 


10,103 


15 


96 


130 


227 


267 


436 


532 


960 


1,110 


1,758 


3,607 


8,257 


20 


83 


112 


197 


231 


380 


462 


828 


958 


1,528 


3,119 


7,156 


25 


74 


99 


176 


207 


342 


414 


739 


855 


1,371 


2,786 


6,404 


30 


67 


90 


161 


189 


313 


379 


673 


778 


1,254 


2,541 


5,848 


40 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,197 


5,069 


50 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,963 


4,536 


60 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


4,142 


70 


42 


58 


106 


124 


209 


250 


435 


505 


830 


1,656 


3,837 


80 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,548 


3,590 


90 


37 


51 


94 


109 


185 


221 


383 


444 


735 


1,458 


3,386 


100 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,383 


3,213 


150 


28 


39 


73 


85 


145 


172 


294 


342 


573 


1,126 


2,626 


200 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


2,276 


250 


21 
19 


30 

27 


57 
52 


66 
60 


114 
104 


134 
122 


226 
206 


263 
240 


447 
409 


870 
793 


2,036 
1,860 


300 



For SI: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 n?fb, 1 pound per square inch = 6.895 kPa, 
1-inch water column = 0.2488 kPa, 1 degree = 0.01745 rad. 

NOTE: Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equiva- 
lent length of tubing to the following equation: L= 1 .3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



FUEL GAS CODE OF NEW YORK STATE 



39 



GAS PIPING INSTALLATIONS 



TABLE 402.4(17) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 



Gas 


Natural 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


0.60 





TUBE SIZE (EHD*) 




Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


270 


353 


587 


700 


1,098 


1,372 


2,592 


2,986 


4,509 


9,599 


21,637 


25 


166 


220 


374 


444 


709 


876 


1,620 


1,869 


2,887 


6,041 


13,715 


30 


151 


200 


342 


405 


650 


801 


1,475 


1,703 


2,642 


5,509 


12,526 


40 


129 


172 


297 


351 


567 


696 


1,273 


1,470 


2,297 


4,763 


10,855 


50 


115 


154 


266 


314 


510 


624 


1,135 


1,311 


2,061 


4,255 


9,715 


75 


93 


124 


218 


257 


420 


512 


922 


1,066 


1,692 


3,467 


7,940 


80 


89 


120 


211 


249 


407 


496 


892 


1,031 


1,639 


3,355 


7,689 


100 


79 


107 


189 


222 


366 


445 


795 


920 


1,471 


2,997 


6,881 


150 


64 


87 


155 


182 


302 


364 


646 


748 


1,207 


2,442 


5,624 


200 


55 


75 


135 


157 


263 


317 


557 


645 


1,049 


2,111 


4,874 


250 


49 


67 


121 


141 


236 


284 


497 


576 


941 


1,886 


4,362 


300 


44 


61 


110 


129 


217 


260 


453 


525 


862 


1,720 


3,983 


400 


38 


52 


96 


111 


189 


225 


390 


453 


749 


1,487 


3,452 


500 


34 


46 


86 


100 


170 


202 


348 


404 


552 


1,329 


3,089 



For SI: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m?/h, 1 pound per square inch = 6.895 kPa, 1 degree = 0.01745 rad. 
NOTES: 

1 . Table does not include effect of pressure drop across the line regulator Where regulator loss exceeds ^^ psi, DO NOT USE THIS TABLE. Consult with regulator 
manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L- \.2>n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



40 



FUEL GAS CODE OF NEW YORK STATE 



GAS PSPDNG INSTALLATIONS 



E 402.4(18) 

ESS STEEL TUBBNG (CSST) 



Gas 


Natural 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 


Specific Gravity 


0.60 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 








iViaximum Capacity in Cubic Feet of Gas per 


Hour 








10 


523 


674 


1,084 


1,304 


1,995 


2,530 


4,923 


5,659 


8,295 


18,080 


40,353 


25 


322 


420 


691 


827 


1,289 


1,616 


3,077 


3,543 


5,311 


11,378 


25,580 


30 


292 


382 


632 


755 


1,181 


1,478 


2,803 


3,228 


4,860 


10,377 


23,361 


40 


251 


329 


549 


654 


1,031 


1,284 


2,418 


2,786 


4,225 


8,972 


20,246 


50 


223 


293 


492 


586 


926 


1,151 


2,157 


2,486 


3,791 


8,015 


18,119 


75 


180 


238 


403 


479 


763 


944 


1,752 


2,021 


3,112 


6,530 


14,809 


80 


174 


230 


391 


463 


740 


915 


1,694 


1,955 


3,016 


6,320 


14,341 


100 


154 


205 


350 


415 


665 


820 


1,511 


1,744 


2,705 


5,646 


12,834 


150 


124 


166 


287 


339 


548 


672 


1,228 


1,418 


2,221 


4,600 


10,489 


200 


107 


143 


249 


294 


478 


584 


1,060 


1,224 


1,931 


3,977 


9,090 


250 


95 


128 


223 


263 


430 


524 


945 


1,092 


1,732 


3,553 


8,135 


300 


86 


116 


204 


240 


394 


479 


860 


995 


1,585 


3,240 


7,430 


400 


74 


100 


177 


208 


343 


416 


742 


858 


1,378 


2,802 


6,439 


500 


66 


89 


159 


186 


309 


373 


662 


766 


1,035 


2,503 


5,762 



For SI: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m'/h, 1 pound per square inch = 6.895 kPa, 1 degree = 0.01745 rad. 



1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds % psi, DO NOT USE THIS TABLE. Consult with regulator 
manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L= 1.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPING INSTALLATIONS 



TABLE 402.4(19) 
POLYETHYLENE PLASTIC PIPE 



Gas 


Natural 


Inlet Pressure 


1 .0 psi or less 


Pressure Drop 


0.3 inch WC 


Specific Gravity 


0.60 





PIPE SIZE (in.) 


Nominal OD 


V, 


'U 


1 


IV. 


iv. 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


iVIaximum Capacity in Cubic Feet of Gas per Hour 


10 


153 


305 


551 


955 


1,442 


2,590 


20 


105 


210 


379 


656 


991 


1,780 


30 


84 


169 


304 


527 


796 


1,430 


40 


72 


144 


260 


451 


681 


1,224 


50 


64 


128 


231 


400 


604 


1,084 


60 


58 


116 


209 


362 


547 


983 


70 


53 


107 


192 


333 


503 


904 


80 


50 


99 


179 


310 


468 


841 


90 


46 


93 


168 


291 


439 


789 


100 


44 


88 


159 


275 


415 


745 


125 


39 


78 


141 


243 


368 


661 


150 


35 


71 


127 


221 


333 


598 


175 


32 


65 


117 


203 


306 


551 


200 


30 


60 


109 


189 


285 


512 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 iT?/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 



42 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(20) 
ETHYLENE PLASTIC PIPE 



Gas 


Natural 


Inlet Pressure 


1.0 psi or less 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


0.60 





PIPE SIZE (in.) 


iMominal OD 


V, 


'U 


1 


IV. 


1% 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


IVlaximum Capacity in Cubic Feet of Gas per Hour 


10 


201 


403 


726 


1,258 


1,900 


3,415 


20 


138 


277 


499 


865 


1,306 


2,347 


30 


111 


222 


401 


695 


1,049 


1,885 


40 


95 


190 


343 


594 


898 


1,613 


50 


84 


169 


304 


527 


796 


1,430 


60 


76 


153 


276 


477 


721 


1,295 


70 


70 


140 


254 


439 


663 


1,192 


80 


65 


131 


236 


409 


617 


1,109 


90 


61 


123 


221 


383 


579 


1,040 


100 


58 


116 


209 


362 


547 


983 


125 


51 


103 


185 


321 


485 


871 


150 


46 


93 


168 


291 


439 


789 


175 


43 


86 


154 


268 


404 


726 


200 


40 


80 


144 


249 


376 


675 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 rrf/h, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa. 



FUEL GAS CODE OF NEW YORK STATE 



43 



GAS PIPING INSTALLATIONS 



TABLE 402.4(21) 
POLYETHYLENE PLASTIC PIPE 



Gas 


Natural 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


0.60 





PIPE SIZE (In.) 


Nominal OD 


v. 


V. 


1 


IV. 


IV, 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Maximum Capacity in Cubic Feet of Gas per Hour 


10 


1,858 


3,721 


6,714 


11,631 


17,565 


31,560 


20 


1,277 


2,557 


4,614 


7,994 


12,072 


21,691 


30 


1,026 


2,054 


3,706 


6,420 


9,695 


17,419 


40 


878 


1,758 


3,172 


5,494 


8,297 


14,908 


50 


778 


1,558 


2,811 


4,869 


7,354 


13,213 


60 


705 


1,412 


2,547 


4,412 


6,663 


11,972 


70 


649 


1,299 


2,343 


4,059 


6,130 


11,014 


80 


603 


1,208 


2,180 


3,776 


5,703 


10,246 


90 


566 


1,134 


2,045 


3,543 


5,351 


9,614 


100 


535 


1,071 


1,932 


3,347 


5,054 


9,081 


125 


474 


949 


1,712 


2,966 


4,479 


8,048 


150 


429 


860 


1,551 


2,688 


4,059 


7,292 


175 


395 


791 


1,427 


2,473 


3,734 


6,709 


200 


368 


736 


1,328 


2,300 


3,474 


6,241 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m^/h, 1 pound per square inch = 6.895 kPa. 



44 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPIMG JNSTALLATIIOWS 



TABLE 402.4(22) 

E 40 METALLBC POPE 
Fiiirs^ Stage (HIigh-piressyire Regulator) 
Stage (Low-pressure Regulator) 



Gas 


Undiluted propane 


Inlet Pressure 


10.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 



PIPE SIZE (in.) 


Nominal Inside 


% 


'U 


1 


IV. 


IV, 


2 


3 


3V, 


4 


Actual 


0.622 


0.824 


1.049 


1.38 


1.61 


2.067 


3.068 


3.548 


4.026 


Length (ft) 


n/laximum Capacity in Thousands of Btu/h 


30 


1,834 


3,835 


7,225 


14,834 


22,225 


42,804 


120,604 


176,583 


245,995 


40 


1,570 


3,283 


6,184 


12,696 


19,022 


36,634 


103,222 


151,132 


210,539 


50 


1,391 


2,909 


5,480 


11,252 


16,859 


32,468 


91,484 


133,946 


186,597 


60 


1,261 


2,636 


4,966 


10,195 


15,275 


29,419 


82,891 


121,364 


169,071 


70 


1,160 


2,425 


4,568 


9,379 


14,053 


27,065 


76,258 


111,654 


155,543 


80 


1,079 


2,256 


4,250 


8,726 


13,074 


25,179 


70,944 


103,872 


144,703 


90 


1,012 


2,117 


3,988 


8,187 


12,267 


23,624 


66,564 


97,460 


135,770 


100 


956 


2,000 


3,767 


7,733 


11,587 


22,315 


62,876 


92,060 


128,247 


150 


768 


1,606 


3,025 


6,210 


9,305 


17,920 


50,492 


73,927 


102,987 


200 


657 


1,374 


2,589 


5,315 


7,964 


15,337 


43,214 


63,272 


88,144 


250 


582 


1,218 


2,294 


4,711 


7,058 


13,593 


38,300 


56,077 


78,120 


300 


528 


1,104 


2,079 


4,268 


6,395 


12,316 


34,703 


50,810 


70,782 


350 


486 


1,015 


1,913 


3,927 


5,883 


11,331 


31,926 


46,744 


65,119 


400 


452 


945 


1,779 


3,653 


5,473 


10,541 


29,701 


43,487 


60,581 


450 


424 


886 


1,669 


3,428 


5,135 


9,890 


27,867 


40,802 


56,841 


500 


400 


837 


1,577 


3,238 


4,851 


9,342 


26,323 


38,541 


53,691 


600 


363 


759 


1,429 


2,934 


4,395 


8,465 


23,851 


34,921 


48,648 


700 


334 


698 


1,314 


2,699 


4,044 


7,788 


21,943 


32,127 


44,756 


800 


310 


649 


1,223 


2,511 


3,762 


7,245 


20,413 


29,888 


41,637 


900 


291 


609 


1,147 


2,356 


3,530 


6,798 


19,153 


28,043 


39,066 


1,000 


275 


575 


1,084 


2,225 


3,334 


6,421 


18,092 


26,489 


36,902 


1,500 


221 


462 


870 


1,787 


2,677 


5,156 


14,528 


21,272 


29,633 


2,000 


189 


395 


745 


1,529 


2,291 


4,413 


12,435 


18,206 


25,362 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1 British thermal unit per hour = 0.2931 W. 



45 



GAS PIPING INSTALLATIONS 



TABLE 402.4(23) 
SCHEDULE 40 METALLIC PIPE 



Gas 


Undiluted propane 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 





PIPE SIZE (In.) 


Nominal 


% 


V. 


1 


l'/4 


IV, 


2 


2'/, 


3 


4 


Actual ID 


omi 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


IViaximum Capacity in Thousands of Btu/h 


10 


2,676 


5,595 


10,539 


21,638 


32,420 


62,438 


99,516 


175,927 


358,835 


20 


1,839 


3,845 


7,243 


14,872 


22,282 


42,913 


68,397 


120,914 


246,625 


30 


1,477 


3,088 


5,817 


11,942 


17,893 


34,461 


54,925 


97,098 


198,049 


40 


1,264 


2,643 


4,978 


10,221 


15,314 


29,494 


47,009 


83,103 


169,504 


50 


1,120 


2,342 


4,412 


9,059 


13,573 


26,140 


41,663 


73,653 


150,229 


60 


1,015 


2,122 


3,998 


8,208 


12,298 


23,685 


37,750 


66,735 


136,118 


70 


934 


1,952 


3,678 


7,551 


11,314 


21,790 


34,729 


61,395 


125,227 


80 


869 


1,816 


3,422 


7,025 


10,526 


20,271 


32,309 


57,116 


116,499 


90 


815 


1,704 


3,210 


6,591 


9,876 


19,020 


30,314 


53,590 


109,307 


100 


770 


1,610 


3,033 


6,226 


9,329 


17,966 


28,635 


50,621 


103,251 


125 


682 


1,427 


2,688 


5,518 


8,268 


15,923 


25,378 


44,865 


91,510 


150 


618 


1,293 


2,435 


5,000 


7,491 


14,427 


22,995 


40,651 


82,914 


175 


569 


1,189 


2,240 


4,600 


6,892 


13,273 


21,155 


37,398 


76,280 


200 


529 


1,106 


2,084 


4,279 


6,411 


12,348 


19,681 


34,792 


70,964 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895kPa, 1 British thermal unit per hour - 0.2931 W. 



46 



FUEL GAS CODE OF NEW YORK STATE 



TABLE 402.4(24) 
SCHEDULE 40 METALLIC PIPE 
iipe Sizing Between Single or Second Stage 
(Low-pressore Regulator) and Appliance 



Gas 


Undiluted propane 


Dniet Pressure 


11.0 inch WC 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


1.50 



PIPE SIZE (in.) 


Nominal Inside 


% 


% 


1 


IV. 


1'/. 


2 


3 


3'/, 


4 


Actual 


0.622 


0.824 


1.049 


1.38 


1.61 


2.067 


3.068 


3.548 


4.026 


Length (ft) 


iVlaximum Capacity in Thousands of Btu/h 


10 


291 


608 


1,145 


2,352 


3,523 


6,786 


19,119 


27,993 


38,997 


20 


200 


418 


787 


1,616 


2,422 


4,664 


13,141 


19,240 


26,802 


30 


160 


336 


632 


1,298 


1,945 


3,745 


10,552 


15,450 


21,523 


40 


137 


287 


541 


1,111 


1,664 


3,205 


9,031 


13,223 


18,421 


50 


122 


255 


480 


984 


1,475 


2,841 


8,004 


11,720 


16,326 


60 


110 


231 


434 


892 


1,337 


2,574 


7,253 


10,619 


14,793 


80 


94 


197 


372 


763 


1,144 


2,203 


6,207 


9,088 


12,661 


100 


84 


175 


330 


677 


1,014 


1,952 


5,501 


8,055 


11,221 


125 


74 


155 


292 


600 


899 


1,730 


4,876 


7,139 


9,945 


150 


67 


140 


265 


543 


814 


1,568 


4,418 


6,468 


9,011 


200 


58 


120 


227 


465 


697 


1,342 


3,781 


5,536 


7,712 


250 


51 


107 


201 


412 


618 


1,189 


3,351 


4,906 


6,835 


300 


46 


97 


182 


373 


560 


1,078 


3,036 


4,446 


6,193 


350 


42 


89 


167 


344 


515 


991 


2,793 


4,090 


5,698 


400 


40 


83 


156 


320 


479 


922 


2,599 


3,805 


5,301 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1-inch water column = 0.2488 kPa, ] British thermal unit per hour = 0.2931 W. 



JEL GAS CODE OF MEW YORK STATE 



47 



GAS PIPING INSTALLATIONS 



TABLE 402.4(25) 

SEMI-RIGID COPPER TUBING 

Sizing Between First Stage (High-pressure Regulator) 

and Second Stage (Low-pressure Regulator) 



Gas 


Undiluted propane 


Inlet Pressure 


10.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 







TUBE SIZE (in.) 


Nominal 


K&L 


'/. 


\ 


'/, 


\ 


'U 


1 


1% 


iv. 


2 


2% 


ACR 


% 


% 


v« 


'U 


% 


l'/« 


1% 


1% 


2V« 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


513 


1,058 


2,152 


3,760 


5,335 


11,396 


20,516 


32,347 


67,371 


119,193 


20 


352 


727 


1,479 


2,585 


3,667 


7,832 


14,101 


22,232 


46,303 


81,921 


30 


283 


584 


1,188 


2,075 


2,944 


6,290 


11,323 


17,853 


37,183 


65,785 


40 


242 


500 


1,016 


1,776 


2,520 


5,383 


9,691 


15,280 


31,824 


56,304 


50 


215 


443 


901 


1,574 


2,234 


4,771 


8,589 


13,542 


28,205 


49,901 


60 


194 


401 


816 


1,426 


2,024 


4,323 


7,782 


12,270 


25,556 


45,214 


70 


179 


369 


751 


1,312 


1,862 


3,977 


7,160 


11,288 


23,511 


41,596 


80 


166 


343 


699 


1,221 


1,732 


3,700 


6,661 


10,502 


21,873 


38,697 


90 


156 


322 


655 


1,145 


1,625 


3,471 


6,250 


9,853 


20,522 


36,308 


100 


147 


304 


619 


1,082 


1,535 


3,279 


5,903 


9,307 


19,385 


34,297 


125 


131 


270 


549 


959 


1,361 


2,906 


5,232 


8,249 


17,181 


30,396 


150 


118 


244 


497 


869 


1,233 


2,633 


4,741 


7,474 


15,567 


27,541 


175 


109 


225 


457 


799 


1,134 


2,423 


4,361 


6,876 


14,321 


25,338 


200 


101 


209 


426 


744 


1,055 


2,254 


4,057 


6,397 


13,323 


23,572 


225 


95 


196 


399 


698 


990 


2,115 


3,807 


6,002 


12,501 


22,117 


250 


90 


185 


377 


659 


935 


1,997 


3,596 


5,669 


11,808 


20,891 


275 


85 


176 


358 


626 


888 


1,897 


3,415 


5,385 


11,215 


19,841 


300 


81 


168 


342 


597 


847 


1,810 


3,258 


5,137 


10,699 


18,929 



For SI: 1 inch - 25 A mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.2931 W. 

NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



48 



FUEL GAS CODE OF NEW YORK STATE 



GAS PDP8MG DNSTALLATSONS 



TABLE 402.4(26) 
SEMS-RBGID COPPER TUBING 

Between Single or Second Stage 
pressure Regulator) and Appliance 



Gas 



Inlet Pressure 



Pressure Drop 



Specific Gravity 



Undiluted propane 



11.0 inch WC 



0.5 inch WC 



1.50 







TUBE SIZE (in.) 


Nominal 


K&L 


% 


\ 


% 


\ 


\ 


1 


1% 


1% 


2 


2V, 


ACR 


\ 


% 


\ 


'U 


y. 


l'/« 


1% 


1% 


2% 


2% 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


iMaxiimum Capacity in Thousands of Btu/h 


10 


45 


93 


188 


329 


467 


997 


1,795 


2,830 


5,895 


10,429 


20 


31 


64 


129 


226 


321 


685 


1,234 


1,945 


4,051 


7,168 


30 


25 


51 


104 


182 


258 


550 


991 


1,562 


3,253 


5,756 


40 


21 


44 


89 


155 


220 


471 


848 


1,337 


2,784 


4,926 


50 


19 


39 


79 


138 


195 


417 


752 


1,185 


2,468 


4,366 


60 


17 


35 


71 


125 


177 


378 


681 


1,074 


2,236 


3,956 


70 


16 


32 


66 


115 


163 


348 


626 


988 


2,057 


3,639 


80 


15 


30 


61 


107 


152 


324 


583 


919 


1,914 


3,386 


90 


14 


28 


57 


100 


142 


304 


547 


862 


1,796 


3,177 


100 


13 


27 


54 


95 


134 


287 


517 


814 


1,696 


3,001 


125 


11 


24 


48 


84 


119 


254 


458 


722 


1,503 


2,660 


150 


10 


21 


44 


76 


108 


230 


415 


654 


1,362 


2,410 


175 


10 


20 


40 


70 


99 


212 


382 


602 


1,253 


2,217 


200 


8.9 


18 


37 


65 


92 


197 


355 


560 


1,166 


2,062 


225 


8.3 


17 


35 


61 


87 


185 


333 


525 


1,094 


1,935 


250 


7.9 


16 


33 


58 


82 


175 


315 


496 


1,033 


1,828 


275 


7.5 


15 


31 


55 


78 


166 


299 


471 


981 


1,736 


300 


7.1 


15 


30 


52 


74 


158 


285 


449 


936 


1,656 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W. 

NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



FUEL GAS CODE OF MEW YORK STATE 



GAS PIPING INSTALLATIONS 



TABLE 402.4(27) 
SEMIRIGID COPPER TUBING 



Gas 


Undiluted propane 


Inlet Pressure 


2.0. psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 





TUBE SIZE (in.) 


Nominal 


K&L 


V4 


\ 


% 


V« 


V4 


1 


IV4 


1% 


2 


2% 


ACR 


\ 


% 


V« 


% 


% 


l'/« 


1% 


1% 


2% 


2\ 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


2.625 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


2.435 


Length (ft) 


IVIaximum Capacity in Thousands of Btu/h 


10 


413 


852 


1,732 


3,027 


4,295 


9,175 


16,517 


26,042 


54,240 


95,962 


20 


284 


585 


1,191 


2,081 


2,952 


6,306 


11,352 


17,899 


37,279 


65,954 


30 


228 


470 


956 


1,671 


2,371 


5,064 


9,116 


14,373 


29,936 


52,963 


40 


195 


402 


818 


1,430 


2,029 


4,334 


7,802 


12,302 


25,621 


45,330 


50 


173 


356 


725 


1,267 


1,798 


3,841 


6,915 


10,903 


22,708 


40,175 


60 


157 


323 


657 


1,148 


1,629 


3,480 


6,266 


9,879 


20,575 


36,401 


70 


144 


297 


605 


1,057 


1,499 


3,202 


5,764 


9,088 


18,929 


33,489 


80 


134 


276 


562 


983 


1,394 


2,979 


5,363 


8,455 


17,609 


31,155 


90 


126 


259 


528 


922 


1,308 


2,795 


5,031 


7,933 


16,522 


29,232 


100 


119 


245 


498 


871 


1,236 


2,640 


4,753 


7,493 


15,607 


27,612 


125 


105 


217 


442 


772 


1,095 


2,340 


4,212 


6,641 


13,832 


24,472 


150 


95 


197 


400 


700 


992 


2,120 


3,817 


6,017 


12,533 


22,173 


175 


88 


181 


368 


644 


913 


1,950 


3,511 


5,536 


11,530 


20,399 


200 


82 


168 


343 


599 


849 


1,814 


3,267 


5,150 


10,727 


18,978 


225 


77 


158 


321 


562 


797 


1,702 


3,065 


4,832 


10,064 


17,806 


250 


72 


149 


304 


531 


753 


1,608 


2,895 


4,564 


9,507 


16,819 


275 


69 


142 


288 


504 


715 


1,527 


2,750 


4,335 


9,029 


15,974 


300 


66 


135 


275 


481 


682 


1,457 


2,623 


4,136 


8,614 


15,240 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1 British thermal unit per hour = 0.2931 W. 

NOTE: Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 



50 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPDMG JIMSTALLATlOiMJ 



TABLE 402.4(28) 
ED STAB^8LESS STEEL 



JBING (CSST) 



Gas 


Undiluted propane 


Inlet Pressure 


11.0 inch WC 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


1.50 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


5 


72 


99 


181 


211 


355 


426 


744 


863 


1,415 


2,830 


6,547 


10 


50 


69 


129 


150 


254 


303 


521 


605 


971 


1,993 


4,638 


15 


39 


55 


104 


121 


208 


248 


422 


490 


775 


1,623 


3,791 


20 


34 


49 


91 


106 


183 


216 


365 


425 


661 


1,404 


3,285 


25 


30 


42 


82 


94 


164 


192 


325 


379 


583 


1,254 


2,940 


30 


28 


39 


74 


87 


151 


177 


297 


344 


528 


1,143 


2,684 


40 


23 


33 


64 


74 


131 


153 


256 


297 


449 


988 


2,327 


50 


20 


30 


58 


66 


118 


137 


227 


265 


397 


884 


2,082 


60 


19 


26 


53 


60 


107 


126 


207 


241 


359 


805 


1,902 


70 


17 


25 


49 


57 


99 


117 


191 


222 


330 


745 


1,761 


80 


15 


23 


45 


52 


94 


109 


178 


208 


307 


696 


1,647 


90 


15 


22 


44 


50 


90 


102 


169 


197 


286 


656 


1,554 


100 


14 


20 


41 


47 


85 


98 


159 


186 


270 


621 


1,475 


150 


11 


15 


31 


36 


66 


75 


123 


143 


217 


506 


1,205 


200 


9 


14 


28 


33 


60 


69 


112 


129 


183 


438 


1,045 


250 


8 


12 


25 


30 


53 


61 


99 


117 


163 


390 


934 


300 


8 


11 


23 


26 


50 


57 


90 


107 


147 


357 


854 



For SI: 1 foot = 304.8 mm, I-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 degree = 0.01745 rad. 

NOTE: Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equiva- 
lent length of tubing to the following equation: L= 1.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



FUEL GAS CODE OF MEW YORK STATE 



51 



GAS PIPING INSTALLATIONS 



TABLE 402.4(29) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 



Gas 


Undiluted propane 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


426 


558 


927 


1,106 


1,735 


2,168 


4,097 


4,720 


7,128 


15,174 


34,203 


25 


262 


347 


591 


701 


1,120 


1,384 


2,560 


2,954 


4,564 


9,549 


21,680 


30 


238 


316 


540 


640 


1,027 


1,266 


2,331 


2,692 


4,176 


8,708 


19,801 


40 


203 


271 


469 


554 


896 


1,100 


2,012 


2,323 


3,631 


7,529 


17,159 


50 


181 


243 


420 


496 


806 


986 


1,794 


2,072 


3,258 


6,726 


15,357 


75 


147 


196 


344 


406 


663 


809 


1,457 


1,685 


2,675 


5,480 


12,551 


80 


140 


189 


333 


393 


643 


768 


1,410 


1,629 


2,591 


5,303 


12,154 


100 


124 


169 


298 


350 


578 


703 


1,256 


1,454 


2,325 


4,738 


10,877 


150 


101 


137 


245 


287 


477 


575 


1,021 


1,182 


1,908 


3,860 


8,890 


200 


86 


118 


213 


248 


415 


501 


880 


1,019 


1,658 


3,337 


7,705 


250 


77 


105 


191 


222 


373 


448 


785 


910 


1,487 


2,981 


6,895 


300 


69 


96 


173 


203 


343 


411 


716 


829 


1,363 


2,719 


6,296 


400 


60 


82 


151 


175 


298 


355 


616 


716 


1,163 


2,351 


5,457 


500 


53 


72 


135 


158 


268 


319 


550 


638 


1,027 


2,101 


4,883 



For SI: 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 degree = 0.01745 rad. 
NOTES: 

1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds '/2 psi (based on 13 in. w.c. outlet pressure), DO NOT USE 
THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L= l.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



52 



FUEL GAS CODE OF NEW YORK STATE 



GAS PtPtWG INSTALLATIOWS 



TABLE 402.4(30) 
ED STAINLESS STEEL TUBS 



(CSST) 



Gas 


Undiluted propane 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 


Specific Gravity 


1.50 





TUBE SIZE (EHD*) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


62 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


826 


1,065 


1,713 


2,061 


3,153 


3,999 


7,829 


8,945 


13,112 


28,580 


63,788 


25 


509 


664 


1,092 


1,307 


2,037 


2,554 


4,864 


5,600 


8,395 


17,986 


40,436 


30 


461 


603 


999 


1,193 


1,866 


2,336 


4,430 


5,102 


7,682 


16,403 


36,928 


40 


396 


520 


867 


1,033 


1,629 


2,029 


3,822 


4,404 


6,679 


14,183 


32,004 


50 


352 


463 


777 


926 


1,463 


1,819 


3,409 


3,929 


5,993 


12,670 


28,642 


75 


284 


376 


637 


757 


1,206 


1,492 


2,769 


3,194 


4,919 


10,322 


23,409 


80 


275 


363 


618 


731 


1,169 


1,446 


2,677 


3,090 


4,768 


9,990 


22,670 


100 


243 


324 


553 


656 


1,051 


1,296 


2,388 


2,756 


4,276 


8,925 


20,287 


150 


196 


262 


453 


535 


866 


1,062 


1,941 


2,241 


3,511 


7,271 


16,581 


200 


169 


226 


393 


464 


755 


923 


1,675 


1,934 


3,052 


6,287 


14,369 


250 


150 


202 


352 


415 


679 


828 


1,493 


1,726 


2,738 


5,616 


12,859 


300 


136 


183 


322 


379 


622 


757 


1,359 


1,572 


2,505 


5,122 


11,745 


400 


117 


158 


279 


328 


542 


657 


1,173 


1,356 


2,178 


4,429 


10,178 


500 


104 


140 


251 


294 


488 


589 


1,046 


1,210 


1,954 


3,957 


9,108 



For SI: 1 foot = 305 mm, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.2931 W, 1 degree = 0.01745 rad. 



1 . Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with regulator manu- 
facturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in table may exceed maximum capacity of selected regulator. Consult with tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



FUEL GAS CODE OF NEW YORK STATE 



53 



GAS PIPING INSTALLATIONS 



TABLE 402.4(31) 
POLYETHYLENE PLASTIC PIPE 



Gas 


Undiluted propane 


Inlet Pressure 


11.0 inch WC 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


1.50 





PIPE SIZE (In.) 


Nominal OD 


V, 


'U 


1 


IV. 


1'/, 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


340 


680 


1,227 


2,126 


3,211 


5,769 


20 


233 


467 


844 


1,461 


2,207 


3,965 


30 


187 


375 


677 


1,173 


1,772 


3,184 


40 


160 


321 


580 


1,004 


1,517 


2,725 


50 


142 


285 


514 


890 


1,344 


2,415 


60 


129 


258 


466 


807 


1,218 


2,188 


70 


119 


237 


428 


742 


1,121 


2,013 


80 


110 


221 


398 


690 


1,042 


1,873 


90 


103 


207 


374 


648 


978 


1,757 


100 


98 


196 


353 


612 


924 


1,660 


125 


87 


173 


313 


542 


819 


1,471 


150 


78 


157 


284 


491 


742 


1,333 


175 


72 


145 


261 


452 


683 


1,226 


200 


67 


135 


243 


420 


635 


1,141 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column - 0.2488 kPa, 1 British thermal unit per hour = 

0.2931 W, 1 degree = 0.01745 rad. 

NOTES: 

1 . Table does not include effect of pressure drop across line regulator. If regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with regulator manufac- 
turer for pressure drops and capacity factors. Pressure drop across regulator may vary with the flow rate. 

2. CAUTION: Capacities shown in table may exceed maximum capacity of selected regulator. Consult with tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = \3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

*EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 



54 



FUEL GAS CODE OF NEW YORK STATE 



GAS PmUG BMSTALLAT10M« 



POLYETHYLENE PLASTBC PIPE 



Gas 


Undiluted propane 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.0 psi 


Specific Gravity 


1.50 





PIPE SIZE (in.) 


Nominal OD 


'/. 


\ 


1 


IV. 


IV, 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual DD 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


3,126 


6,259 


11,293 


19,564 


29,545 


53,085 


20 


2,148 


4,302 


7,762 


13,446 


20,306 


36,485 


30 


1,725 


3,454 


6,233 


10,798 


16,307 


29,299 


40 


1,477 


2,957 


5,335 


9,242 


13,956 


25,076 


50 


1,309 


2,620 


4,728 


8,191 


12,369 


22,225 


60 


1,186 


2,374 


4,284 


7,421 


11,207 


20,137 


70 


1,091 


2,184 


3,941 


6,828 


10,311 


18,526 


80 


1,015 


2,032 


3,666 


6,352 


9,592 


17,235 


90 


952 


1,907 


3,440 


5,960 


9,000 


16,171 


100 


899 


1,801 


3,249 


5,629 


8,501 


15,275 


125 


797 


1,596 


2,880 


4,989 


7,535 


13,538 


150 


722 


1,446 


2,609 


4,521 


6,827 


12,266 


175 


664 


1,331 


2,401 


4,159 


6,281 


11,285 


200 


618 


1,238 


2,233 


3,869 


5,843 


10,498 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.2931 W. 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPING INSTALLATIONS 



TABLE 402.4(33) 
POLYETHYLENE PLASTIC TUBING 



Gas 


Undiluted propane 


Inlet pressure 


11.0 inch WC 


Pressure Drop 


0.5 inch WC 


Specific Gravity 


1.50 





PLASTIC TUBING SIZE (CTS) (in.) 


Nominal OD 


V, 


'U 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Maximum Capacity in Thousands of Btu/h 


10 


121 


828 


20 


83 


569 


30 


67 


457 


40 


57 


391 


50 


51 


347 


60 


46 


314 


70 


42 


289 


80 


39 


269 


90 


37 


252 


100 


35 


238 


125 


31 


211 


150 


28 


191 


175 


26 


176 


200 


24 


164 


225 


22 


154 


250 


21 


145 


275 


20 


138 


300 


19 


132 


350 


18 


121 


400 


16 


113 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 \M 1-inch water column = 0.2488 kPa. 



56 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPIING INSTALLATIOMS 



PIPING lyiATERIALS 

403.1 GemeraD. Materials used for piping systems shall comply 
with the requirements of this chapter. 

403.2 Used materials. Pipe, fittings, valves and other materials 
shall not be used again except where they are free of foreign 
materials and have been ascertained to be adequate for the ser- 
vice intended. 

403.3 Other materials. Material not covered by the standards 
specifications listed herein shall be investigated and tested to 
determine that it is safe and suitable for the proposed service, 
and, in addition, shall be recommended for that service by the 
manufacturer. 

403.4 Metallic pipe. Metallic pipe shall comply with Sections 
403.4.1 through 403.4.4. 

403.4.1 Cast nrom. Cast-iron pipe shall not be used. 

403.4.2 Steel, Steel and wrought-iron pipe shall be at least 
of standard weight (Schedule 40) and shall comply with one 
of the following standards: 

1. ASMEB 36.10, lOM; 

2. ASTM A 53; or 

3. ASTM A 106. 



jr and brass. Copper and brass pipe shall not 
be used if the gas contains more than an average of 0.3 
grains of hydrogen sulfide per 100 standard cubic feet of gas 
(0.7 milligrams per 100 liters). Threaded copper, brass and 
aluminum-alloy pipe shall not be used with gases corrosive 
to such materials. 



. Aluminum-alloy pipe shall comply with 
ASTM B 241 (except that the use of alloy 5456 is prohibited), 
and shall be marked at each end of each length indicating 
compliance. Aluminum-alloy pipe shall be coated to protect 
against external corrosion where it is in contact with masonry, 
plaster, or insulation, or is subject to repeated wettings by 
such liquids as water, detergents, or sewage. Aluminum-alloy 
pipe shall not be used in exterior locations or underground. 



ng. Seamless copper, aluminum alloy and 
steel tubing shall not be used with gases corrosive to such mate- 
rials. 

403.5.1 Steel tuMeg. Steel tubing shall comply with ASTM 
A 254 or ASTM A 539. 



ig. Copper tubing shall 
comply with Standard Type K or L of ASTM B 88 or ASTM 
B280. 

Copper and brass tubing shall not be used if the gas con- 
tains more than an average of 0.3 grains of hydrogen sulfide 
per 100 standard cubic feet of gas (0.7 milligrams per 100 li- 
ters). 

403.5.3 Alumtmiiim teMmg. Aluminum-alloy tubing shall 
comply with ASTM B 210 or ASTM B 241. Aluminum-al- 
loy tubing shall be coated to protect against external corro- 
sion where it is in contact with masonry, plaster or 



insulation, or is subject to repeated wettings by such liquids 
as water, detergent or sewage. 

Aluminum-alloy tubing shall not be used in exterior loca- 
tions or underground. 



stalmless steel tuitoimg. Corrugated 
stainless steel tubing shall be tested and listed in compliance 
with the construction, installation and performance require- 
ments of ANSI LC 1/CSA 6.26. 



Bgs, Plastic pipe, tubing 
and fittings shall be used outside, underground, only, and shall 
conform to ASTM D 2513. Pipe shall be marked "gas" and 

"ASTM D 2513." 



,1 Anodeless risers. Plastic pipe, tubing and 
anodeless risers shall comply with the following: 

1. Factory-assembled anodeless risers shall be recom- 
mended by the manufacturer for the gas used and 
shall be leak tested by the manufacturer in accordance 
with written procedures. 

2. Service head adapters and field-assembled anodeless 
risers incorporating service head adapters shall be 
recommended by the manufacturer for the gas used, 
and shall be designed and certified to meet the re- 
quirements of Category I of ASTM D 2513, and U.S. 
Department of Transportation, Code of Federal Regu- 
lations, Title 49, Part 192.281(e). The manufacturer 
shall provide the user with qualified installation in- 
structions as prescribed by the U.S. Department of 
Transportation, Code of Federal Regulations, Title 
49, Part 192.283(b). 

403,6,2 LP=gas systems. The use of plastic pipe, tubing and 
fittings in undiluted liquefied petroleum gas piping systems 
shall be in accordance with NFPA 58. 



403.7 Workmanship and defects. Pipe, tubing and fittings 
shall be clear and free from cutting burrs and defects in struc- 
ture or threading, and shall be thoroughly brushed, and chip 
and scale blown. 

Defects in pipe, tubing and fittings shall not be repaired. De- 
fective pipe, tubing and fittings shall be replaced (see Section 
406.1.2). 



Bg. Where in contact with material or at- 
mosphere exerting a corrosive action, metallic piping and fit- 
tings coated with a corrosion-resistant material shall be used. 
External or internal coatings or linings used on piping or com- 
ponents shall not be considered as adding strength. 

403.9 Metallic pipe threads. Metallic pipe and fitting threads 
shall be taper pipe threads and shall comply with ASME 
Bl.20.1. 



Is. Pipe with threads that are 
stripped, chipped, corroded or otherwise damaged shall not 
be used. Where a weld opens during the operation of cutting 
or threading, that portion of the pipe shall not be used. 



i. Field threading of metallic 
pipe shall be in accordance with Table 403.9.2. 



FUEL GAS CODE OF MEW YORK STATE 



57 



GAS PIPING INSTALLATIONS 



TABLE 403.9.2 
SPECIFICATIONS FOR THREADING METALLIC PIPE 



IRON PIPE SIZE 
(inches) 


APPROXIMATE 

LENGTH OF 

THREADED PORTION 

(inches) 


APPROXIMATE 

NUMBER OF THREADS 

TO BE CUT 


V, 


V. 


10 


V. 


\ 


10 


1 


'k 


10 


IV. 


1 


11 


IV, 


1 


11 


2 


1 


11 


2V, 


1% 


12 


3 


IV, 


12 


4 


1% 


13 



For SI: 1 inch = 25.4 ram. 

403.9.3 Thread compoonds. Thread (joint) compounds 
(pipe dope) shall be resistant to the action of liquefied petro- 
leum gas or to any other chemical constituents of the gases 
to be conducted through the piping. 

403.10 Metallic piping joints and fittings. The type of piping 
joint used shall be suitable for the pressure-temperature condi- 
tions and shall be selected giving consideration to joint tight- 
ness and mechanical strength under the service conditions. The 
joint shall be able to sustain the maximum end force caused by 
the internal pressure and any additional forces caused by tem- 
perature expansion or contraction, vibration, fatigue or the 
weight of the pipe and its contents. 

403.10.1 Pipe joints. Pipe joints shall be threaded, flanged, 
brazed or welded. Where nonferrous pipe is brazed, the 
brazing materials shall have a melting point in excess of 
1,000°F (538°C). Brazing alloys shall not contain more than 
0.05-percent phosphorus. 

403.10.2 Tubing joints. Tubing joints shall be either made 
with approved gas tubing fittings or brazed with a material 
having a melting point in excess of 1,000°F (538°C). 
Brazing alloys shall not contain more than 0.05-percent 
phosphorus. 

403.10.3 Flared joints. Flared joints shall be used only in 
systems constructed from nonferrous pipe and tubing where 
experience or tests have demonstrated that the joint is suit- 
able for the conditions and where provisions are made in the 
design to prevent separation of the joints. 

403.10.4 Metallic fittings. Metallic fittings, including 
valves, strainers and filters, shall comply with the following: 

1. Threaded fittings in sizes larger than 4 inches (102 
mm) shall not be used except where approved. 

2. Fittings used with steel or wrought-iron pipe shall be 
steel, brass, bronze, malleable iron or cast iron. 

3. Fittings used with copper or brass pipe shall be cop- 
per, brass or bronze. 

4. Fittings used with aluminum-alloy pipe shall be of 
aluminum alloy. 

5. Cast-iron fittings: 



5.1. Flanges shall be permitted. 

5.2. Bushings shall not be used. 

5.3. Fittings shall not be used in systems contain- 
ing flammable gas-air mixtures. 

5.4. Fittings in sizes 4 inches (102 mm) and larger 
shall not be used indoors except where ap- 
proved. 

5.5. Fittings in sizes 6 inches (152 mm) and larger 
shall not be used except where approved. 

6. Aluminum-alloy fittings. Threads shall not form the 
joint seal. 

7. Zinc aluminum-alloy fittings. Fittings shall not be 
used in systems containing flammable gas-air mix- 
tures. 

8. Special fittings. Fittings such as couplings, propri- 
etary-type joints, saddle tees, gland-type compression 
fittings, and flared, flareless or compression-type tub- 
ing fittings shall be: used within the fitting manufac- 
turer's pressure-temperature recommendations; used 
within the service conditions anticipated with respect 
to vibration, fatigue, thermal expansion or contrac- 
tion; installed or braced to prevent separation of the 
joint by gas pressure or external physical damage; and 
shall be approved. 

403.11 Plastic pipe, joints and fittings. Plastic pipe, tubing 
and fittings shall be joined in accordance with the manufactur- 
er's instructions. Such joint shall comply with the following: 

1 . The joint shall be designed and installed so that the longi- 
tudinal pull-out resistance of the joint will be at least 
equal to the tensile strength of the plastic piping material. 

2. Heat-fusion joints shall be made in accordance with 
qualified procedures that have been established and 
proven by test to produce gas-tight joints at least as 
strong as the pipe or tubing being joined. Joints shall be 
made with the joining method recommended by the pipe 
manufacturer. Heat fusion fittings shall be marked 
"ASTMD2513." 

3. Where compression-type mechanical joints are used, the 
gasket material in the fitting shall be compatible with the 
plastic piping and with the gas distributed by the system. 
An internal tubular rigid stiffener shall be used in con- 
junction with the fitting. The stiffener shall be flush with 
the end of the pipe or tubing and shall extend at least to 
the outside end of the pipe or tubing and at least to the 
outside end of the compression fitting when installed. 
The stiffener shall be free of rough or sharp edges and 
shall not be a force fit in the plastic. Split tubular sdffen- 
ers shall not be used. 

4. Plastic piping joints and fittings for use in liquefied pe- 
troleum gas piping systems shall be in accordance with 

NFPA 58. 

403.12 Flanges. All flanges shall comply with ASME B16.1, 
ASMEB 16.20, AWWA CI 11/A21. 11 or MSSSP-6. The pres- 
sure-temperature ratings shall equal or exceed that required by 
the application. 

403.12.1 Flange facings. Standard facings shall be permit- 
ted for use under this code. Where 150-pound (1034 kPa) 



58 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPDNG JMSTALLATDOMS 



pressure-rated steel flanges are bolted to Class 125 cast-iron 
flanges, the raised face on the steel flange shall be removed. 



inches (5 1 mm) beyond the point where the pipe emerges from 
the floor. 



L12o2 Lapped lainigeSo Lapped flanges shall be used 
only above ground or in exposed locations accessible for in- 
spection. 

4®3.13 Flamge gasketSo Material for gaskets shall be capable of 
withstanding the design temperature and pressure of the piping 
system, and the chemical constituents of the gas being con- 
ducted, without change to its chemical and physical properties. 
The effects of fire exposure to the joint shall be considered in 
choosing material. Acceptable materials include metal or 
metal-jacketed asbestos (plain or corrugated), asbestos, and 
aluminum "O" rings and spiral wound metal gaskets. When a 
flanged joint is opened, the gasket shall be replaced. Full-face 
gaskets shall be used with all bronze and cast-iron flanges. 



PmUQ SYI 



ECTi 
ITEff 



nSo Piping shall not be installed in or 
through a circulating air duct, clothes chute, chimney or gas 
vent, ventilating duct, dumbwaiter or elevator shaft. 



ISo Concealed piping 
shall not be located in solid partitions and solid walls, unless in- 
stalled in a chase or casing. 



Portions of a piping sys- 
tem installed in concealed locations shall not have unions, tub- 
ing fittings, right and left couplings, bushings, compression 
couplings and swing joints made by combinations of fittings. 

Exceptions; 

1 . Tubing joined by brazing. 

2. Fittings listed for use in concealed locations. 

404.4 Pnpnmg throEglh ffoemdlatiom walL Underground piping, 
where installed below grade through the outer foundation or 
basement wall of a building, shall be encased in a protective 
pipe sleeve. The annular space between the gas piping and the 
sleeve shall be sealed. 



Protectnoe aganeslt plhyskal damage. In concealed lo- 
cations, where piping other than black or galvanized steel is in- 
stalled through holes or notches in wood studs, joists, rafters or 
similar members less than 1 inch (25 mm) from the nearest 
edge of the member, the pipe shall be protected by shield plates. 
Shield plates shall be a minimum of Vig-inch-thick (1.6 mm) 
steel, shall cover the area of the pipe where the member is 
notched or bored, and shall extend a minimum of 4 inches (102 
mm) above sole plates, below top plates and to each side of a 
stud, joist or rafter. 



i. Piping in solid floors shall be laid 
in channels in the floor and covered in a manner that will allow 
access to the piping with a minimum amount of damage to the 
building. Where such piping is subject to exposure to excessive 
moisture or corrosive substances, the piping shall be protected 
in an approved manner. As an alternative to installation in chan- 
nels, the piping shall be installed in a casing of Schedule 40 
steel, wrought iron, PVC or ABS pipe with tightly sealed ends 
and joints. Both ends of such casing shall extend not less than 2 



.7 Albove-groinmid oiuiMoor pnpniiig. All piping installed 
outdoors shall be elevated not less than 3'/2 inches (152 mm) 
above ground and where installed across roof surfaces, shall be 
elevated not less than 3'/2 inches (152 imn) above the roof sur- 
face. Piping installed above ground, outdoors, and installed 
across the surface of roofs shall be securely supported and lo- 
cated where it will be protected from physical damage. Where 
passing through an outside wall, the piping shall also be pro- 
tected against corrosion by coating or wrapping with an inert 
material. Where piping is encased in a protective pipe sleeve, 
the annular space between the piping and the sleeve shall be 
sealed. 



i.§ Protectlom aganmsH; corrosnom. Metallic pipe or tubing 
exposed to corrosive action, such as soil condition or moisture, 
shall be protected in an approved manner. Zinc coatings (galva- 
nizing) shall not be deemed adequate protection for gas piping 
underground. Ferrous metal exposed in exterior locations shall 
be protected from corrosion. Where dissimilar metals are 
joined underground, an insulating coupling or fitting shall be 
used. Piping shall not be laid in contact with cinders. 

404.8.1 Prolhnlbnlted use. Uncoated threaded or socket 
welded joints shall not be used in piping in contact with soil 
or where internal or external crevice corrosion is known to 
occur. 



ng. Pipe protec- 
tive coatings and wrappings shall be approved for the appli- 
cation and shall be factory applied. 



tmmi Where installed in accordance with the man- 
ufacturer's installation instructions, field application of 
coatings and wrappings shall be permitted for pipe nip- 
ples, fittings and locations where the factory coating or 
wrapping has been damaged or necessarily removed at 
joints. 



am bmirnal depth. Underground piping systems 
shall be installed a minimum depth of 12 inches (305 mm) be- 
low grade, except as provided for in Section 404.9. 1 . 

404.9.1 Indlvtdiiall ootsMe appMances, Individual lines to 
outside lights, grills or other appliances shall be installed a 
minimum of 8 inches (203 mm) below finished grade, pro- 
vided that such installation is approved and is installed in lo- 
cations not susceptible to physical damage. 



The trench shall be graded so that the pipe 
has a firm, substantially continuous bearing on the bottom of 
the trench. 

404.11 Piping omdergrooirid toemeatlh buiiBdDinigs. Piping in- 
stalled underground beneath buildings is prohibited except 
where the piping is encased in a conduit of wrought iron, plas- 
tic pipe, or steel pipe designed to withstand the superimposed 
loads. Such conduit shall extend into an occupiable portion of 
the building and, at the point where the conduit terminates in 
the building, the space between the conduit and the gas piping 
shall be sealed to prevent the possible entrance of any gas leak- 
age. Where the end sealing is capable of withstanding the full 
pressure of the gas pipe, the conduit shall be designed for the 
same pressure as the pipe. Such conduit shall extend not less 



FUEL GAS CODE OF NEW YORK STATE 



59 



GAS PIPING INSTALLATIONS 



than 4 inches (102 mm) outside the building, shall be vented 
above grade to the outdoors, and shall be installed so as to pre- 
vent the entrance of water and insects. The conduit shall be pro- 
tected from corrosion in accordance with Section 404.8. 

404.12 Outlet closures. Gas outlets that do not connect to ap- 
pliances shall be capped gas tight. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.13 Location of outlets. The unthreaded portion of piping 
outlets shall extend not less than 1 inch (25 mm) through fin- 
ished ceilings and walls and where extending through floors or 
outdoor patios and slabs, shall not be less than 2 inches (51 
mm) above them. The outlet fitting or piping shall be securely 
supported. Outlets shall not be placed behind doors. Outlets 
shall be located in the room or space where the appliance is in- 
stalled. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.14 Plastic pipe. The installation of plastic pipe shall com- 
ply with Sections 404.14.1 through 404.14.3. 

404.14.1 Limitations. Plastic pipe shall be installed outside 
underground only. Plastic pipe shall not be used within or 
under any building or slab or be operated at pressures 
greater than 100 psig (689 kPa) for natural gas or 30 psig 
(207 kPa) for LP-gas. 

Exceptions: 

1 . Plastic pipe shall be permitted to terminate above 
ground outside of buildings where installed in 
premanufactured anodeless risers or service head 
adapter risers that are installed in accordance with 
the manufacturer's installation instructions. 

2. Plastic pipe shall be permitted to terminate with a 
wall head adapter within buildings where the plas- 
tic pipe is inserted in a piping material for fuel gas 
use in buildings. 

404.14.2 Connections. Connections made outside and un- 
derground between metallic and plastic piping shall be 
made only with transition fittings categorized as Category I 
in accordance with ASTM D 2513. 

404.14.3 Tracer. A yellow insulated copper tracer wire or 
other approved conductor shall be installed adjacent to un- 
derground nonmetallic piping. Access shall be provided to 
the tracer wire or the tracer wire shall terminate above 
ground at each end of the nonmetallic piping. The tracer 
wire size shall not be less than 18 AWG and the insulation 
type shall be suitable for direct burial. 

404.15 Prohibited devices. A device shall not be placed inside 
the piping or fittings that will reduce the cross-sectional area or 
otherwise obstruct the free flow of gas. 

Exception: Approved gas filters. 



404.16 Testing of piping. Before any system of piping is put in 
service or concealed, it shall be tested to ensure that it is gas 
tight. Testing, inspection and purging of piping systems shall 
comply with Section 406. 



SECTION 405 (IFGS) 
PIPING BENDS AND CHANGES IN DIRECTION 

405.1 General. Changes in direction of pipe shall be permitted 
to be made by the use of fittings, factory bends or field bends. 

405.2 Metallic pipe. Metallic pipe bends shall comply with the 
following: 

1. Bends shall be made only with bending equipment and 
procedures intended for that purpose. 

2. All bends shall be smooth and free from buckling, 
cracks, or other evidence of mechanical damage. 

3 . The longitudinal weld of the pipe shall be near the neutral 
axis of the bend. 

4. Pipe shall not be bent through an arc of more than 90 de- 
grees (1.6 rad). 

5. The inside radius of a bend shall be not less than six times 
the outside diameter of the pipe. 

405.3 Plastic pipe. Plastic pipe bends shall comply with the 
following: 

1 . The pipe shall not be damaged and the internal diameter 
of the pipe shall not be effectively reduced. 

2. Joints shall not be located in pipe bends. 

3. The radius of the inner curve of such bends shall not be 
less than 25 times the inside diameter of the pipe. 

4. Where the piping manufacturer specifies the use of spe- 
cial bending equipment or procedures, such equipment 
or procedures shall be used. 

405.4 Mitered bends. Mitered bends are permitted subject to 
the following limitations: 

1 . Miters shall not be used in systems having a design pres- 
sure greater than 50 psig (340 kPa gauge). Deflections 
caused by misalignments up to 3 degrees (0.05 rad) shall 
not be considered as miters. 

2. The total deflection angle at each miter shall not exceed 
90 degrees (1.6 rad). 

405.5 Elbows. Factory-made welding elbows or transverse 
segments cut therefrom shall have an arc length measured 
along the crotch at least 1 inch (25 mm) in pipe sizes 2 inches 
(5 1 mm) and larger. 



SECTION 406 (IFGS) 
INSPECTION, TESTING AND PURGING 

406.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to de- 
termine that the materials, design, fabrication, and installation 
practices comply with the requirements of this code. 

406.1.1 Inspections. Inspection shall consist of visual ex- 
amination, during or after manufacture, fabrication, assem- 
bly, or pressure tests as appropriate. Supplementary types of 



60 



FUEL GAS CODE OF NEW YORK STATE 



GAS PIPING INSTALLATDONS 



nondestructive inspection techniques, such as mag- 
netic-particle, radiographic, ultrasonic, etc., shall not be re- 
quired unless specifically listed herein or in the engineering 
design. 



In the event repairs or addi- 
tions are made after the pressure test, the affected piping 
shall be tested. 

Exception: Minor repairs and additions are not required 
to be pressure tested, provided that the work is inspected 
and connections are tested with a noncorrosive leak-de- 
tecting fluid. 



Where new branches are installed 
from the point of delivery to new appliances, only the newly 
installed branches shall be required to be pressure tested. 
Connections between the new piping and the existing piping 
shall be tested with a noncorrosive leak-detecting fluid or 
other approved leak-detecting methods. 

406.1.4 SectloE testimg. A piping system shall be permitted 
to be tested as a complete unit or in sections. Under no cir- 
cumstances shall a valve in a line be used as a bulkhead be- 
tween gas in one section of the piping system and test 
medium in an adjacent section, unless two valves are in- 
stalled in series with a valved "telltale" located between 
these valves. A valve shall not be subjected to the test pres- 
sure unless it can be determined that the valve, including the 
valve-closing mechanism, is designed to safely withstand 
the test pressure. 



Ll.S Regelators amd valve assemblies. Regulator and 
valve assemblies fabricated independently of the piping sys- 
tem in which they are to be installed shall be permitted to be 
tested with inert gas or air at the time of fabrication. 



The test medium shall be air, nitrogen, 
!l carbon dioxide or an inert gas. Oxygen shall not be used. 

406.3 Test preparatiom. Pipe joints, including welds, shall be 
left exposed for examination during the test. 

Exceptnoe; Covered or concealed pipe end joints that have 
been previously tested in accordance with this code. 

406.3.1 Expannsiom jolmts. Expansion joints shall be pro- 
vided with temporary restraints, if required, for the addi- 
tional thrust load under test. 



Equipment that is not to be 
included in the test shall be either disconnected from the 
piping or isolated by blanks, blind flanges, or caps. Flanged 
joints at which blinds are inserted to blank off other equip- 
ment during the test shall not be required to be tested. 



Iscoimmectiom, Where the piping sys- 
tem is connected to equipment or components designed for 
operating pressures of less than the test pressure, such 
equipment or equipment components shall be isolated from 
the piping system by disconnecting them and capping the 
outlet(s). 

406.3.4 Valve Isolation. Where the piping system is con- 
nected to equipment or components designed for operating 
pressures equal to or greater than the test pressure, such 
equipment shall be isolated from the piping system by clos- 
ing the individual equipment shutoff valve(s). 



.3,5 Testing precautions. All testing of piping systems 
shall be done with due regard for the safety of employees 
and the public during the test. Bulkheads, anchorage and 
bracing suitably designed to resist test pressures shall be in- 
stalled if necessary. Prior to testing, the interior of the pipe 
shall be cleared of all foreign material. 

406.4 Test pressure measurement. Test pressure shall be 
measured with a manometer or with a pressure-measuring de- 
vice designed and calibrated to read, record or indicate a pres- 
sure loss caused by leakage during the pressure test period. The 
source of pressure shall be isolated before the pressure tests are 
made. Mechanical gauges used to measure test pressures shall 
have a range such that the highest end of the scale is not greater 
than five times the test pressure. 



.4.1 Test pressure. The test pressure to be used shall be 
no less than l'/2 times the proposed maximum working 
pressure, but not less than 3 psig (20 kPa gauge), irrespec- 
tive of design pressure. Where the test pressure exceeds 125 
psig (862 kPa gauge), the test pressure shall not exceed a 
value that produces a hoop stress in the piping greater than 
50 percent of the specified minimum yield strength of the 
pipe. 



B.4.2 Test deration. Test duration shall be not less than 
^2 hour for each 500 cubic feet (14 m^) of pipe volume or 
fraction thereof. When testing a system having a volume 
less than 10 cubic feet (0.28 m^) or a system in a single-fam- 
ily dwelling, the test duration shall be not less than 10 min- 
utes. The duration of the test shall not be required to exceed 
24 hours. 

406.5 Detection of leaks and defects. The piping system shall 
withstand the test pressure specified without showing any evi- 
dence of leakage or other defects. 

Any reduction of test pressures as indicated by pressure 
gauges shall be deemed to indicate the presence of a leak unless 
such reduction can be readily attributed to some other cause. 



lethods. The leakage shall be located 
by means of an approved gas detector, a noncorrosive leak 
detection fluid or other approved leak detection methods. 
Matches, candles, open flames or other methods that could 
provide a source of ignition shall not be used. 



.5.2 Corrections. Where leakage or other defects are lo- 
cated, the affected portion of the piping system shall be re- 
paired or replaced, and retested. 

406.6 System and equipment leakage test. Leakage testing of 
systems and equipment shall be in accordance with Sections 
406.6.1 through 406.6.4. 



6.1 Test gases. Leak checks using fuel gas shall be per- | 
mitted in piping systems that have been pressure tested in 
accordance with Section 406. 



ig gas on. Before gas is introduced 
into a system of new gas piping, the entire system shall be 
inspected to determine that there are no open fittings or ends 
and that all valves at unused outlets are closed and plugged 
or capped. 

406.6.3 Test for leakage. Immediately after the gas is 
turned on into a new system or into a system that has been 



FUEL GAS CODE OF NEW YORK STATE 



61 



GAS PIPING INSTALLATIONS 



initially restored after an interruption of service, the piping 
system shall be tested for leakage. Where leakage is indi- 
cated, the gas supply shall be shut off until the necessary re- 
pairs have been made. 

406.6.4 Placing equipment in operation. Gas utilization 
equipment shall be permitted to be placed in operation after 
the piping system has been tested and determined to be free 
of leakage and purged in accordance with Section 406.7.2. 

406.7 Purging. Purging of piping shall comply with Sections 
406.7.1 through 406.7.4. 

406.7.1 Removal from service. Where gas piping is to be 
opened for servicing, addition or modification, the section 
to be worked on shall be turned off from the gas supply at the 
nearest convenient point, and the line pressure vented to the 
outdoors, or to ventilated areas of sufficient size to prevent 
accumulation of flammable mixtures. 

The remaining gas in this section of pipe shall be dis- 
placed with an inert gas as required by Table 406.7.1. 

TABLE 406.7.1 
LENGTH OF PIPING REQUIRING PURGING WIThS 
INERT GAS FOR SERVICING OR MODIFICATION 



NOMINAL PIPE SIZE 
(inches) 


LENGTH OF PIPING 
REQUIRING PURGING 


2'/, 


> 50 feet 


3 


> 30 feet 


4 


> 15 feet 


6 


> 10 feet 


8 or larger 


Any length 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

406.7.2 Placing in operation. Where piping full of air is 
placed in operation, the air in the piping shall be displaced 
with fuel gas, except where such piping is required by Table 
406.7.2 to be purged with an inert gas prior to introduction 
of fuel gas. The air can be safely displaced with fuel gas pro- 
vided that a moderately rapid and continuous flow of fuel 
gas is introduced at one end of the line and air is vented out 
at the other end. The fuel gas flow shall be continued with- 
out interruption until the vented gas is free of air. The point 
of discharge shall not be left unattended during purging. Af- 
ter purging, the vent shall then be closed. Where required by 
Table 406.7.2, the air in the piping shall first be displaced 
with an inert gas, and the inert gas shall then be displaced 
with fuel gas. 

TABLE 406.7.2 

LENGTH OF PIPING REQUIRING PURGING WITH 

INERT GAS BEFORE PLACING IN OPERATION 



NOMINAL PIPE SIZE 
(inches) 


LENGTH OF PIPING 
REQUIRING PURGING 


3 


> 30 feet 


4 


> 15 feet 


6 


> 10 feet 


8 or larger 


Any length 



406.7.3 Discharge of purged gases. The open end of piping 
systems being purged shall not discharge into confined 
spaces or areas where there are sources of ignition unless 
precautions are taken to perform this operation in a safe 
manner by ventilation of the space, control of purging rate, 
and elimination of all hazardous conditions. 

406.7.4 Placing equipment in operation. After the piping 
has been placed in operation, all equipment shall be purged 
and then placed in operation, as necessary. 



SECTION 407 
PIPING SUPPORT 

407.1 General, Piping shall be provided with support in accor- 
dance with Section 407.2. 

407.2 Design and installation. Piping shall be supported with 
pipe hooks, metal pipe straps, bands, brackets or hangers suit- 
able for the size of piping, of adequate strength and quality, and 
located at intervals so as to prevent or damp out excessive vi- 
bration. Piping shall be anchored to prevent undue strains on 
connected equipment and shall not be supported by other pip- 
ing. Pipe hangers and supports shall conform to the require- 
ments of MSS SP-58 and shall be spaced in accordance with 
Section 415. Supports, hangers and anchors shall be installed 
so as not to interfere with the free expansion and contraction of 
the piping between anchors. All parts of the supporting equip- 
ment shall be designed and installed so they will not be disen- 
gaged by movement of the supported piping. 



SECTION 408 
DRIPS AND SLOPED PIPING 

408.1 Slopes. Piping for other than dry gas conditions shall be 
sloped not less than ^1^ inch in 15 feet (6.3 mm in 4572 mm) to 
prevent traps. 

408.2 Drips. Where wet gas exists, a drip shall be provided at 
any point in the line of pipe where condensate could collect. A 
drip shall also be provided at the outlet of the meter and shall be 
installed so as to constitute a trap wherein an accumulation of 
condensate will shut off the flow of gas before the condensate 
will run back into the meter. 



L3 Location of drips. Drips shall be provided with ready 
access to permit cleaning or emptying. A drip shall not be lo- 
cated where the condensate is subject to freezing. 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 



\A Sediment trap. Where a sediment trap is not incorpo- 
rated as part of the gas utilization equipment, a sediment trap 
shall be installed downstream of the equipment shutoff valve as 
close to the inlet of the equipment as practical. The sediment 
trap shall be either a tee fitting with a capped nipple in the bot- 
tom opening of the run of the tee or other device approved as an 
effective sediment trap. Illuminating appliances, ranges, 
clothes dryers and outdoor grills need not be so equipped. 



SECTION 409 
SHUTOFF VALVES 

409.1 General. Piping systems shall be provided with shutoff 
valves in accordance with this section. 



62 



FUEL GAS CODE OF NEW YORK STATE 



409olol Valve approval. Shutoff valves shall be of an ap- 
proved type. Shutoff valves shall be constructed of materials 
compatible with the piping. Shutoff valves installed in a por- 
tion of a piping system operating above 0.5 psig shall com- 
ply with ASME B 16.33. Shutoff valves installed in a 
portion of a piping system operating at 0.5 psig or less shall 
comply with ANSI Z 21.15 or ASME B 16.33. 



D§. Shutoff valves shall be pro- 
hibited in concealed locations and furnace plenums. 

409<,lo3 Access to shutoff valves. Shutoff valves shall be lo- 
cated in places so as to provide access for operation and 
shall be installed so as to be protected from damage. 



^•2 Meter valve= Every meter shall be equipped with a shut- 
off valve located on the supply side of the meter. 



le=Ilioiise lime systems. Where 
a single meter is used to supply gas to more than one building or 
tenant, a separate shutoff valve shall be provided for each 
building or tenant. 



409.3ol Multiple temamt talMIngSo In multiple tenant 
buildings, where a common piping system is installed to 
supply other than one- and two-family dwellings, shutoff 
valves shall be provided for each tenant. Each tenant shall 
have access to the shutoff valve serving that tenant's space. 



ngs. In a common system serving 
more than one building, shutoff valves shall be installed out- 
doors at each building. 



Each house line 
shutoff valve shall be plainly marked with an identification 
tag attached by the installer so that the piping systems sup- 
plied by such valves are readily identified. 



MP Regulator valves. A listed shutoff valve shall be in- 
stalled immediately ahead of each MP regulator. 



' valve. Each appliance shall be pro- 
vided with a shutoff valve separate from the appliance. The 
shutoff valve shall be located in the same room as the appli- 
ance, not further than 6 feet (1829 mm) from the appliance, and 
shall be installed upstream from the union, connector or quick 
disconnect device it serves. Such shutoff valves shall be pro- 
vided with access. 

Exceptlom: Shutoff valves for vented decorative appliances 
and decorative appliances for installation in vented fire- 
places shall not be prohibited from being installed in an area 
remote from the appliance where such valves are provided 
with ready access. Such valves shall be permanently identi- 
fied and shall serve no other equipment. Piping from the 
shutoff valve to within 3 feet (914 mm) of the appliance con- 
nection shall be sized in accordance with Section 402. 



5.1 Shetofflr valve m Hreplace. Equipment shutoff 
valves located in the firebox of a fireplace shall be installed 
in accordance with the appliance manufacturer's instruc- 
tions. 



FLOW CONTROLS 

410.1 Pressure regulators. A line pressure regulator shall be 
installed where the appliance is designed to operate at a lower 
pressure than the supply pressure. Access shall be provided to 
pressure regulators. Pressure regulators shall be protected from 
physical damage. Regulators installed on the exterior of the 
building shall be approved for outdoor installation. 

MP pressure regulators shall comply 



regi 
with the following: 

1 . The MP regulator shall be approved and shall be suitable 
for the inlet and outlet gas pressures for the application. 

2. The MP regulator shall maintain a reduced outlet pres- 
sure under lockup (no-flow) conditions. 

3. The capacity of the MP regulator, determined by pub- 
lished ratings of its manufacturer, shall be adequate to 
supply the appliances served. 

4. The MP pressure regulator shall be provided with access. 
Where located indoors, the regulator shall be vented to 
the outdoors or shall be equipped with a leak-limiting de- 
vice, in either case complying with Section 410.3. 

5. A tee fitting with one opening capped or plugged shall be 
installed between the MP regulator and its upstream 
shutoff valve. Such tee fitting shall be positioned to allow 
connection of a pressure-measuring instrument and to 
serve as a sediment trap. 

6. A tee fitting with one opening capped or plugged shall be 
installed not less than 10 pipe diameters downstream of 
the MP regulator outlet. Such tee fitting shall be posi- 
tioned to allow connection of a pressure-measuring in- 
strument. 



}f regulators. Pressure regulators that require a 
vent shall have an independent vent to the outside of the build- 
ing. The vent shall be designed to prevent the entry of water or 
foreign objects. 



imni A vent to the outside of the building is not re- 
quired for regulators equipped with and labeled for utiliza- 
tion with approved vent-limiting devices installed in 
accordance with the manufacturer's instructions. 



iCTI©N 41 1 

CE CONNECTIONS 

411.1 Coemectmg appllamces. Appliances shall be connected 
to the piping system by one of the following: 

1. Rigid metallic pipe and fittings. 

2. Semirigid metallic tubing and metallic fittings. Lengths 
shall not exceed 6 feet (1829 mm) and shall be located 
entirely in the same room as the apphance. Semirigid 
metallic tubing shall not enter a motor-operated appli- 
ance through an unprotected knockout opening. 

3. Listed and labeled appliance connectors installed in ac- 
cordance with the manufacturer's installation instruc- 
tions and located entirely in the same room as the 
appliance. 



FUEL GAS CODE OF 



YORK STATE 



GAS PgPING INSTALLATIONS 



4. Listed and labeled quick-disconnect devices used in con- 
junction with listed and labeled appliance connectors. 

5. Listed and labeled convenience outlets used in conjunc- 
tion with listed and labeled appliance connectors. 

6. Listed and labeled appliance connectors complying with 
ANSI Z21.69 and listed for use with food service equip- 
ment having casters, or that is otherwise subject to move- 
ment for cleaning, and other large movable equipment. 

411.1.1 Protection from damage. Connectors and tubing 
shall be installed so as to be protected against physical dam- 
age. 

411.1.2 Appliance fuel connectors. Connectors shall have 
an overall length not to exceed 3 feet (914 mm), except for 
range and domestic clothes dryer connectors, which shall 
not exceed 6 feet (1829 mm) in length. Connectors shall not 
be concealed within, or extended through, walls, floors, par- 
titions, ceilings or appliance housings. A shutoff valve not 
less than the nominal size of the connector shall be installed 
ahead of the connector in accordance with Section 409.5. 
Connectors shall be sized to provide the total demand of the 
connected appliance. 

Exception: Fireplace inserts factory equipped with 
grommets, sleeves, or other means of protection in ac- 
cordance with the listing of the appliance. 

411.1.3 Movable appliances. Where appliances are 
equipped with casters or are otherwise subject to periodic 
movement or relocation for purposes such as routine clean- 
ing and maintenance, such appliances shall be connected to 
the supply system piping by means of an approved flexible 
connector designed and labeled for the application. Such 
flexible connectors shall be installed and protected against 
physical damage in accordance with the manufacturer's in- 
stallation instructions. 



SECTION 412 

LIQUEFIED PETROLEUM GAS MOTOR 

FUEL-DISPENSING FACILITIES 

412.1 General. Motor fuel-dispensing facilities for LP-gas 
fuel shall be in accordance with this section and the Fire Code 
of New York State. The operation of LP-gas motor fuel-dis- 
pensing facilities shall be regulated by the Fire Code of New 
York State. 

412.2 Storage and dispensing. Storage vessels and equipment 
used for the storage or dispensing of LP-gas shall be approved 
or listed in accordance with Sections 412.3 and 412.4. 

412.3 Approved equipment. Containers; pressure-relief de- 
vices, including pressure-relief valves; and pressure regulators 
and piping used for LP-gas shall be approved. 

412.4 Listed equipment. Hoses, hose connections, vehicle 
fuel connections, dispensers, LP-gas pumps and electrical 
equipment used for LP-gas shall be listed. 

412.5 Attendants. Motor vehicle fueling operations shall be 
conducted by qualified attendants or in accordance with Sec- 
tion 412.8 by persons trained in the proper handling of LP-gas. 



412.6 Location. In addition to the fuel dispensing require- 
ments of the Fire Code of New York State, the point of transfer 
for dispensing operations shall be 25 feet (7620 mm) or more 
from buildings having combustible exterior wall surfaces, 
buildings having noncombustible exterior wall surfaces that 
are not part of a 1-hour fire-resistance-rated assembly or build- 
ings having combustible overhangs, property which could be 
built on public streets, or sidewalks and railroads; and at least 
10 feet (3048 mm) from driveways and buildings having 
noncombustible exterior wall surfaces that are part of a fire-re- 
sistance-rated assembly having a rating of 1 hour or more. 

Exception: The point of transfer for dispensing operations 
need not be separated from canopies providing weather pro- 
tection for the dispensing equipment constructed in accor- 
dance with the Building Code of New York State. 

Liquefied petroleum gas containers shall be located in accor- 
dance with the Fire Code of New York State, Liquefied petro- 
leum gas storage and dispensing equipment shall be located 
outdoors and in accordance with the Fire Code of New York 
State. 

412.7 Installation of dispensing devices and equipment. The 

installation and operation of LP-gas dispensing systems shall 
be in accordance with this section and the Fire Code of New 
York State. Liquefied petroleum gas dispensers and dispensing 
stations shall be installed in accordance with manufacturers' 
specifications and their listing. 

412.7.1 Valves. A manual shutoff valve and an excess 
flow-control check valve shall be located in the liquid line 
between the pump and the dispenser inlet where the dis- 
pensing device is installed at a remote location and is not 
part of a complete storage and dispensing unit mounted on a 
common base. 

An excess flow-control check valve or an emergency 
shutoff valve shall be installed in or on the dispenser at the 
point at which the dispenser hose is connected to the liquid 
piping. A differential backpressure valve shall be consid- 
ered equivalent protection. A listed shutoff valve shall be lo- 
cated at the discharge end of the transfer hose. 

412.7.2 Hoses. Hoses and piping for the dispensing of 
LP-gas shall be provided with hydrostatic relief valves. The 
hose length shall not exceed 18 feet (5486 mm). An ap- 
proved method shall be provided to protect the hose against 
mechanical damage. 

412.7.3 Vehicle impact protection. Vehicle impact protec- 
tion for LP-gas storage containers, pumps and dispensers 
shall be provided in accordance with the Fire Code of New 
York State. 

412.8 Private fueling of motor vehicles. Self-service LP-gas 
dispensing systems, including key, code and card lock dispens- 
ing systems, shall not be open to the public and shall be limited 
to the filling of permanently mounted fuel containers on 
LP-gas powered vehicles. In addition to the requirements in the 
Fire Code of New York State, self-service LP-gas dispensing 
systems shall be provided with an emergency shutoff switch lo- 
cated within 100 feet (30 480 mm) of, but not less than 20 feet 
(6096 mm) from, dispensers and the owner of the dispensing 



64 



FUEL GAS CODE OF NEW YORK STATE 



facility shall ensure the safe operation of the system and the 
training of users. 



COMPRESSED MMURAL GAS iiOTOR 
FUEL=DISPEWSIMG FACILmES 

,1 GemeraL Motor fuel-dispensing facilities for CNG fuel 
shall be in accordance with this section and the Fire Code of 
New York State. The operation of CNG motor fuel-dispensing 
facilities shall be regulated by the Fire Code of New York State. 



L Storage vessels and equipment used for the 
storage, compression or dispensing of CNG shall be approved 
or Usted in accordance with Sections 413.2.1 and 413.2.2. 

413.2.1 Approved equipmeinit. Containers; compressors; 
pressure-relief devices, including pressure-relief valves; 
and pressure regulators and piping used for CNG shall be 
approved. 



eqimpmemlt. Hoses, hose connections, dis- 
pensers, gas detection systems and electrical equipment 
used for CNG shall be listed. Vehicle fueling connections 
shall be listed and labeled. 



ff dlSspeinisninig operatnoims anndl eqinnpmeitiill;. 
Compression, storage and dispensing equipment shall be lo- 
cated above ground outside. 



1 . Compression, storage or dispensing equipment is al- 
lowed in buildings of noncombustible construction, 
as set forth in the Building Code of New York State, 
which are unenclosed for three-quarters or more of 
the perimeter. 

2. Compression, storage and dispensing equipment is al- 
lowed to be located indoors in accordance with the 
Fire Code of New York State. 

413.3.1 Locatnoira omi property. In addition to the fuel-dis- 
pensing requirements of the Fire Code of New York State, 
compression, storage and dispensing equipment shall not be 
installed: 

1 . Beneath power lines. 

2. Less than 10 feet (3048 mm) from the nearest building 
or property line which could be built on, public street, 
sidewalk or source of ignition. 

ExcepHioims Dispensing equipment need not be 
separated from canopies providing weather pro- 
tection for the dispensing equipment constructed 
in accordance with the Building Code of New York 
State. 

3. Less than 25 feet (7620 mm) from the nearest rail of 
any railroad track. 

4. Less than 50 feet (15 240 mm) from the nearest rail of 
any railroad main track or any railroad or transit line 
where power for train propulsion is provided by an 
outside electrical source such as third rail or overhead 
catenary. 



5. Less than 50 feet (15 240 mm) from the vertical plane 
below the nearest overhead wire of a trolley bus line. 

I Private fmeMeg off motor veMcles. Self-service 
CNG-dispensing systems, including key, code and card lock 
dispensing systems, shall be limited to the filling of perma- 
nently mounted fuel containers on CNG-powered vehicles. 

In addition to the requirements in the Fire Code of New York 
State, the owner of a self-service CNG-dispensing facility shall 
ensure the safe operation of the system and the training of us- 
ers. 



Pressure regelators. Pressure regulators shall be de- 
signed, installed or protected so their operation will not be af- 
fected by the elements (freezing rain, sleet, snow, ice, mud or 
debris). This protection is allowed to be integral with the regu- 
lator. 



IS. Piping to equipment shall be provided with a 
manual shutoff valve. Such valve shall be provided with ready 
access. 

413.7 Emergenncy slmiiMowm eqeipmemt. An emergency shut- 
down device shall be located within 75 feet (22 860 mm) of, but 
not less than 25 feet (7620 mm) from, dispensers and shall also 
be provided in the compressor area. Upon activation, the emer- 
gency shutdown shall automatically shut off the power supply 
to the compressor and close valves between the main gas sup- 
ply and the compressor and between the storage containers and 
dispensers. 



Ischarge off CNG from motor velnkle ffuel storage 
rs. The discharge of CNG from motor vehicle fuel 
cylinders for the purposes of maintenance, cylinder certifica- 
tion, calibration of dispensers or other activities shall be in ac- 
cordance with this section. The discharge of CNG from motor 
vehicle fuel cylinders shall be accomplished through a closed 
transfer system or an approved method of atmospheric venting 
in accordance with Section 413.8.1 or 413.8.2. 

413o§.l Closed tramsfer system. A documented procedure 
which explains the logical sequence for discharging the cyl- 
inder shall be provided to the code enforcement official. The 
procedure shall include what actions the operator will take 
in the event of a low-pressure or high-pressure natural gas 
release during the discharging activity. A drawing illustrat- 
ing the arrangement of piping, regulators and equipment 
settings shall be provided to the code enforcement official. 
The drawing shall illustrate the piping and regulator ar- 
rangement and shall be shown in spatial relation to the loca- 
tion of the compressor, storage vessels and emergency 
shutdown devices. 



nerk veetnmgo Atmospheric venting of 
motor vehicle fuel cylinders shall be in accordance with 
Sections 413.8.2.1 through 413.8.2.6. 

413.8.2.1 PBams amd spedicatloms. A drawing illustrat- 
ing the location of the vessel support, piping, the method 
of grounding and bonding, and other requirements speci- 
fied herein shall be provided to the code enforcement of- 
ficial. 



413.8,2.2 CyMmder stability. A method of rigidly sup- 
porting the vessel during the venting of CNG shall be 
provided. The selected method shall provide not less 



FUEL GAS CODE OF NEW YORK STATE 



S5 



GAS PSPING INSTALLATIONS 



than two points of support and shall prevent the horizon- 
tal and lateral movement of the vessel. The system shall 
be designed to prevent the movement of the vessel based 
on the highest gas-release velocity through valve orifices 
at the vessel's rated pressure and volume. The structure 
or appurtenance shall be constructed of noncombustible 
materials. 

413.8.2.3 Separation. The structure or appurtenance 
used for stabilizing the cylinder shall be separated from 
the site equipment, features and exposures and shall be 
located in accordance with Table 413.8.2.3. 

TABLE 413.8.2.3 

SEPARATION DISTANCE FOR 

ATMOSPHERIC VENTING OF CNG 



EQUIPMENT OR 
FEATURE 


MINIMUM 
SEPARATION (feet) 


Buildings 


25 


Building openings 


25 


Lot lines 


15 


Public ways 


15 


Vehicles 


25 


CNG compressor and storage vessels 


25 


CNG dispensers 


25 



For SI: 1 foot = 304.8 mm. 

413.8.2.4 Grounding and bonding. The structure or ap- 
purtenance used for supporting the cylinder shall be 
grounded in accordance with Chapter 27 of the Building 
Code of New York State. The cylinder valve shall be 
bonded prior to the commencement of venting opera- 
tions. 

413.8.2.5 Vent tube. A vent tube that will divert the gas 
flow to the atmosphere shall be installed on the cylinder 
prior to the commencement of the venting and purging 
operation. The vent tube shall be constructed of pipe or 
tubing materials approved for use with CNG in accor- 
dance with the Fire Code of New York State. 

The vent tube shall be capable of dispersing the gas a 
minimum of 10 feet (3048 mm) above grade level. The 
vent tube shall not be provided with a rain cap or other 
feature which would limit or obstruct the gas flow. 

At the connection fitting of the vent tube and the CNG 
cylinder, a listed bidirectional detonation flame arrester 
shall be provided. 

413.8.2.6 Signage. Approved NO SMOKING signs 
shall be posted within 10 feet (3048 mm) of the cylinder 
support structure or appurtenance. Approved CYLIN- 
DER SHALL BE BONDED signs shall be posted on the 
cylinder support structure or appurtenance. 



effective means such as a backpressure regulator and relief 
valve shall be provided to prevent air or oxygen from passing 
back into the gas piping. Where oxygen is used, installation 
shall be in accordance with NFPA 5 1 . 

414.2 Interconnections for standby fuels. Where supplemen- 
tary gas for standby use is connected downstream from a meter 
or a service regulator where a meter is not provided, a device to 
prevent backflow shall be installed. A three-way valve installed 
to admit the standby supply and at the same time shut off the 
regular supply shall be permitted to be used for this purpose. 



SECTION 415 
PIPING SUPPORT INTERVALS 

415.1 Interval of support. Piping shall be supported at inter- 
vals not exceeding the spacing specified in Table 415.1. 
Spacing of supports for CSST shall be in accordance with the 
CSST manufacturer's instructions. 

TABLE 415.1 
SUPPORT OF PIPING 



STEEL PIPE, 

NOMINAL SIZE 

OF PIPE 

(inches) 


SPACING OF 

SUPPORTS 

(feet) 


NOMINAL SIZE 
OF TUBING 

(SMOOTH-WALL) 

(Inch O.D.) 


SPACING OF 

SUPPORTS 

(feet) 


V, 


6 


'A 


4 


V4 or I 


8 


V«or3/4 


6 


1 '/4 or larger 
(horizontal) 


10 


%orl 
(Horizontal) 


8 


l'/4 or larger 
(vertical) 


Every floor 
level 


1 or Larger 
(vertical) 


Every floor 
level 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 



SECTION 416 
OVERPRESSURE PROTECTION DEVICES 

416.1 General. Overpressure protection devices shall be pro- 
vided in accordance with Section 5.9 of NFPA 54 to prevent the 
pressure in the piping system from exceeding the value that 
would cause unsafe operation of any connected and properly 
adjusted gas utilization equipment. 



SECTION 414 
SUPPLEMENTAL AND STANDBY GAS SUPPLY 

414.1 Use of air or oxygen under pressure. Where air or oxy- 
gen under pressure is used in connection with the gas supply, 



66 



FUEL GAS CODE OF NEW YORK STATE 



GENERAL 

501.1 Scope. This chapter shall govern the installation, mainte- 
nance, repair and approval of factory-built chimneys, chimney 
liners, vents and connectors and the utilization of masonry 
chimneys serving gas-fired appliances. The requirements for 
the installation, maintenance, repair and approval of fac- 
tory-built chimneys, chimney liners, vents and connectors 
serving appliances burning fuels other than fuel gas shall be 
regulated by the Mechanical Code of New York State. The con- 
struction, repair, maintenance and approval of masonry chim- 
neys shall be regulated by the Building Code of New York State. 

501.2 General. Every appliance shall discharge the products of 
combustion to the outdoors, except for appliances exempted by 
Section 501.8. 

501.3 Masonry cMmeeys. Masonry chimneys shall be con- 
structed in accordance with Section 503.5.3 and the Building 
Code of New York State. 

501.4 Mietmiim size of cliimmey or vemt. Chimneys and vents 
shall be sized in accordance with Section 504. 



opeeimgs. Abandoned inlet openings 
in chimneys and vents shall be closed by an approved method. 

501.6 Positive pressere. Where an appliance equipped with a 
mechanical forced draft system creates a positive pressure in 
the venting system, the venting system shall be designed for 
positive pressure applications. 

501.7 Coemectlon to ireplace. Connection of appliances to 
chimney flues serving fireplaces shall be in accordance with 
Sections 501.7.1 through 501.7.3. 



access. A noncombustible seal shall 
be provided below the point of connection to prevent entry 
of room air into the flue. Means shall be provided for access 
to the flue for inspection and cleaning. 

501.7.2 Coonectioffli to ffactory-beilt fireplace flee. An ap- 
pliance shall not be connected to a flue serving a fac- 
tory-built fireplace unless the appliance is specifically listed 
for such installation. The connection shall be made in accor- 
dance with the appliance manufacturer's installadon in- 
structions. 

501.7.3 Coraiectnon to masonry fireplace fflee. A connec- 
tor shall extend from the appliance to the flue serving a ma- 
sonry fireplace such that the flue gases are exhausted 
directly into the flue. The connector shall be accessible or 
removable for inspection and cleaning of both the connector 
and the flue. Listed direct connection devices shall be in- 
stalled in accordance with their listing. 

501.8 Equipmemt moil; required to be vented. The following 
apphances shall not be required to be vented. 

1. Ranges. 



2. Built-in domestic cooking units listed and marked for 
optional venting. 

3. Hot plates and laundry stoves. 

4. Type 1 clothes dryers (Type 1 clothes dryers shall be 
exhausted in accordance with the requirements of Sec- 
tion 614). 

5. A single booster-type automatic instantaneous water 
heater, where designed and used solely for the sanitiz- 
ing rinse requirements of a dishwashing machine, pro- 
vided that the heater is installed in a commercial 
kitchen having a mechanical exhaust system. Where in- 
stalled in this manner, the draft hood, if required, shall 
be in place and unaltered and the draft hood outlet shall 
be not less than 36 inches (914 mm) vertically and 6 
inches (152 mm) horizontally from any surface other 
than the heater. 

6. Refrigerators. 

7. Counter appliances. 

8. Room heaters listed for unvented use. 
,9. Direct-fired make-up air heaters. 

10. Other equipment listed for unvented use and not pro- 
vided with flue collars. 

1 1 . Specialized equipment of Hmited input such as labora- 
tory burners and gas lights. 

Where the appliances and equipment listed in Items 5 
through 1 1 above are installed so that the aggregate input rating 
exceeds 20 British thermal units (Btu) per hour per cubic feet 
(207 watts per m^) of volume of the room or space in which 
such appliances and equipment are installed, one or more shall 
be provided with venting systems or other approved means for 
conveying the vent gases to the outdoor atmosphere so that the 
aggregate input rating of the remaining unvented appliances 
and equipment does not exceed the 20 Btu per hour per cubic 
foot (207 watts per m^) figure. Where the room or space in 
which the equipment is installed is directly connected to an- 
other room or space by a doorway, archway or other opening of 
comparable size that cannot be closed, the volume of such adja- 
cent room or space shall be permitted to be included in the cal- 
culations. 

501.9 CSiimney entrance. Connectors shall connect to a ma- 
sonry chimney flue at a point not less than 12 inches (305 mm) 
above the lowest portion of the interior of the chimney flue. 

501.10 Connections to exhauster. Appliance connections to a 
chimney or vent equipped with a power exhauster shall be 
made on the inlet side of the exhauster. Joints on the positive 
pressure side of the exhauster shall be sealed to prevent 
flue-gas leakage as specified by the manufacturer's installation 
instructions for the exhauster. 

501.11 Masonry cMmneys. Masonry chimneys utilized to 
vent appliances shall be located, constructed and sized as spec- 



FUEL GAS CODE OF MEW YORK STATE 



67 



CHIMNEYS AND VENTS 



ified in the manufacturer's installation instructions for the ap- 
pliances being vented and Section 503. 

501.12 Residential and low-heat appliances floe lining sys- 
tems. Flue lining systems for use with residential-type and 
low-heat appliances shall be limited to the following: 

1. Clay flue lining complying with the requirements of 
ASTM C 315 or equivalent. Clay flue hning shall be in- 
stalled in accordance with the Building Code of New York 
State. 

2. Listed chimney lining systems complying with UL 1777. 

501.13 Category I appliance flue lining systems. Flue lining 
systems for use with Category I appliances shall be limited to 
the following: 

1. Flue lining systems complying with Section 501.12. 

2. Chimney lining systems listed and labeled for use with 
gas appliances with draft hoods and other Category I gas 
apphances hsted and labeled for use with Type B vents. 

501.14 Category II, III and IV appliance venting systems. 
The design, sizing and installation of vents for Category II, III 
and IV appliances shall be in accordance with the appliance 
manufacturer's installation instructions. 

501.15 Existing chimneys and vents. Where an appliance is 
permanently disconnected from an existing chimney or vent, or 
where an appliance is connected to an existing chimney or vent 
during the process of a new installation, the chimney or vent 
shall comply with Sections 501.15.1 through 501.15.4. 

501.15.1 Size. The chimney or vent shall be resized as nec- 
essary to control flue gas condensation in the interior of the 
chimney or vent and to provide the appliance or appliances 
served with the required draft. For Category I appliances, 
the resizing shall be in accordance with Section 502. 

501.15.2 Flue passagev^^ays. The flue gas passageway shall 
be free of obstructions and combustible deposits and shall 
be cleaned if previously used for venting a solid or liquid 
fuel-burning appliance or fireplace. The flue liner, chimney 
inner wall or vent inner wall shall be continuous and shall be 
free of cracks, gaps, perforations or other damage or deteri- 
oration which would allow the escape of combustion prod- 
ucts, including gases, moisture and creosote. 

501.15.3 Cleanout. Masonry chimney flues shall be pro- 
vided with a cleanout opening having a minimum height of 
6 inches (152 mm). The upper edge of the opening shall be 
located not less than 6 inches (152 mm) below the lowest 
chimney inlet opening. The cleanout shall be provided with 
a tight-fitting, noncombustible cover. 

501.15.4 Clearances. Chimneys and vents shall have air- 
space clearance to combustibles in accordance with the 
Building Code of New York State and the chimney or vent 
manufacturer's installation instructions. Noncombustible 
firestopping or fireblocking shall be provided in accordance 
with the Building Code of New York State. 

Exception: Masonry chimneys equipped with a chim- 
ney lining system tested and listed for installation in 
chimneys in contact with combustibles in accordance 
with UL 1777, and installed in accordance with the man- 
ufacturer's instructions, shall not be required to have 



clearance between combustible materials and exterior 
surfaces of the masonry chimney. 



SECTION 502 
VENTS 

502.1 General. All vents, except as provided in Section 503.7, 
shall be listed and labeled. Type B and B W vents shall be tested 
in accordance with UL 441. Type L vents shall be tested in ac- 
cordance with UL 641 . Vents for Category II and III appliances 
shall be tested in accordance with UL 1738. Plastic vents for 
Category IV appliances shall not be required to be listed and la- 
beled where such vents are as specified by the appliance manu- 
facturer and are installed in accordance with the appliance 
manufacturer's installation instructions. 

502.2 Connectors required. Connectors shall be used to con- 
nect appliances to the vertical chimney or vent, except where 
the chimney or vent is attached directly to the appliance. Vent 
connector size, material, construction and installation shall be 
in accordance with Section 503. 

502.3 Vent application. The application of vents shall be in ac- 
cordance with Table 503.4. 

502.4 Insulation shield. Where vents pass through insulated 
assemblies, an insulation shield constructed of not less than 26 
gage sheet (0.016 inch) (0.4 mm) metal shall be installed to pro- 
vide clearance between the vent and the insulation material. 
The clearance shall not be less than the clearance to combusti- 
bles specified by the vent manufacturer's installation instruc- 
tions. Where vents pass through attic space, the shield shall 
terminate not less than 2 inches (5 1 mm) above the insulation 
materials and shall be secured in place to prevent displacement. 
Insulation shields provided as part of a listed vent system shall 
be installed in accordance with the manufacturer's installation 
instructions. 

502.5 Installation. Vent systems shall be sized, installed and 
terminated in accordance with the vent and appliance manufac- 
turer's installation instructions and Section 503. 

502.6 Support of vents. All portions of vents shall be ade- 
quately supported for the design and weight of the materials 
employed. 



SECTION 503 (IFGS) 
VENTING OF EQUIPMENT 

503.1 General. This section recognizes that the choice of vent- 
ing materials and the methods of installation of venting sys- 
tems are dependent on the operating characteristics of the 
equipment being vented. The operating characteristics of 
vented equipment can be categorized with respect to (1) posi- 
tive or negative pressure within the venting system; and (2) 
whether or not the equipment generates flue or vent gases that 
might condense in the venting system. See Section 202 for the 
definition of these vented appliance categories. 

503.2 Venting systems required. Except as permitted in Sec- 
tions 503.2. 1 through 503.2.4 and 501.8, all equipment shall be 
connected to venting systems. 



68 



FUEL GAS CODE OF NEW YORK STATE 



CMDMNEYS AND VENTS 



503o2ol Vemtilalting Hioods. Ventilating hoods and exhaust 
systems shall be permitted to be used to vent equipment in- 
stalled in commercial applications (see Section 503.3.4) and 
to vent industrial equipment, such as where the process it- 
self requires fume disposal. 



spaceSo Where located in a large 
and well-ventilated space, industrial equipment shall be per- 
mitted to be operated by discharging the flue gases directly 
into the space. 

503o2<,3 Dlreclt-veinit equipmemt Listed direct-vent equip- 
ment shall be considered properly vented where installed in 
accordance with the terms of its listing, the manufacturer's 
instructions and Section 503.8, Item 3. 



503.2.4 Equipmemt with leltegral vemts. Equipment incor- 
porating integral venting means shall be considered prop- 
erly vented when installed in accordance with its listing, the 
manufacturer's instructions and Section 503.8, Items 1 and 

2. 



si 



^^o^ ju-cajigun iminiui <s.>u/uusiLii uiiLu-uw-iiu. A ventlug systcm shall be de- 
signed and constructed so as to develop a positive flow ade- 
quate to convey flue or vent gases to the outdoor atmosphere. 

503.3,1 Equipmemt draflt reqeiremeimtSo A venting system 
shall satisfy the draft requirements of the equipment in ac- 
cordance with the manufacturer's instructions. 



comstractnon. Gas utilization equip- 
ment required to be vented shall be connected to a venting 
system designed and installed in accordance with the provi- 
sions of Sections 503.4 through 503.15. 

503,3.3 Mechaekffll dralFlt systems. Mechanical draft sys- 
tems shall comply with the following: 

1 . Mechanical draft systems shall be listed and shall be 
installed in accordance with the terms of their listing 
and both the appliance and the mechanical draft sys- 
tem manufacturer's instructions. 

2. Equipment, except incinerators, requiring venting 
shall be permitted to be vented by means of mechani- 
cal draft systems of either forced or induced draft 
design. 

3. Forced draft systems and all portions of induced draft 
systems under positive pressure during operation 
shall be designed and installed so as to prevent leak- 
age of flue or vent gases into a building. 

4. Vent connectors serving equipment vented by natural 
draft shall not be connected into any portion of me- 
chanical draft systems operating under positive 
pressure. 

5. When a mechanical draft system is employed, provi- 
sion shall be made to prevent the flow of gas to the 
main burners when the draft system is not performing 
so as to satisfy the operating requirements of the 
equipment for safe performance. 

6. The exit terminals of mechanical draft systems shall 
be not less than 7 feet (2134 mm) above grade where 
located adjacent to public walkways and shall be lo- 
cated as specified in Section 503.8, Items 1 and 2. 



exhaest systems. Venti- 
lating hoods and exhaust systems shall be permitted to be 
used to vent gas utilization equipment installed in commer- 
cial applications. Where automatically operated equipment 
is vented through a ventilating hood or exhaust system 
equipped with a damper or with a power means of exhaust, 
provisions shall be made to allow the flow of gas to the main 
burners only when the damper is open to a position to prop- 
erly vent the equipment and when the power means of ex- 
haust is in operation. 



^ Senums, No 

portion of a venting system shall extend into or pass through 
any circulating air duct or furnace plenum. 

503.4 Type of vemtlmg system to be used. The type of venting 
system to be used shall be in accordance with Table 503.4. 



hlmneys. Ma- 
sonry, metal and factory-built chimneys shall comply with Sec- 
tions 503.5.1 through 503.5.10. 



503.5.1 Factory-beilt clilminieys. Factory-built chimneys 
shall be installed in accordance with their listing and the 
manufacturers' instructions. Factory-built chimney s used to 
vent appliances that operate at positive vent pressure shall 
be listed for such application. 

503.5.2 Metal ctiimneys. Metal chimneys shall be built and 
installed in accordance with NFPA 211. 

503.5.3 Masomry ciimneys. Masonry chimneys shall be 
built and installed in accordance with NFPA 211 and shall 
be lined with approved clay flue lining, a listed chimney lin- 
ing system, or other approved material that will resist corro- 
sion, erosion, softening, or cracking from vent gases at 
temperatures up to 1800°F (982°C). 

Exception; Masonry chimney flues serving listed gas 
appliances with draft hoods. Category I appliances, and 
other gas appliances listed for use with Type B vent shall 
be permitted to be lined with a chimney lining system 
specifically hsted for use only with such appliances. The 
liner shall be installed in accordance with the liner manu- 
facturer's instructions and the terms of the listing. A per- 
manent identifying label shall be attached at the point 
where the connection is to be made to the liner. The label 
shall read: "This chimney liner is for appliances that bum 
gas only. Do not connect to solid or liquid fuel-burning 
appliances or incinerators." 

For information on installation of gas vents in existing 
masonry chimneys, see Section 503.6.5. 



Chimneys for residen- 
tial-type or low-heat gas utihzation equipment shall extend at 
least 3 feet (914 mm) above the highest point where it passes 
through a roof of a building and at least 2 feet (610 mm) 
higher than any portion of a building within a horizontal dis- 



ig. Plastic piping used for venting | 
equipment listed for use with such venting materials shall be I 
approved. 

503.4.2 Special gas venit. Special gas vent shall be listed 
and installed in accordance with the terms of the special gas 
vent listing and the manufacturers' instructions. 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 



TABLE 503.4 
TYPE OF VENTING SYSTEM TO BE USED 



GAS UTILIZATION EQUIPMENT 


TYPE OF VENTING SYSTEM 


Listed Category I equipment 

Listed equipment equipped with draft hood 

Equipment Hsted for use with Type B gas vent 


Type B gas vent (Section 503.6) 

Chimney (Section 503.5) 

Single-wall metal pipe (Section 503.7) 

Listed chimney lining system for gas venting (Section 503.5.3) 

Special gas vent listed for this equipment (Section 503.4.2) 


Listed vented wall furnaces 


Type B-W gas vent (Sections 503.6, 608) 


Category II equipment 


As specified or furnished by manufacturers of listed equipment 
(Sections 503.4.1, 503.4.2) 


Category III equipment 


As specified or furnished by manufacturers of listed equipment 
(Sections 503.4.1, 503.4.2) 


Category IV equipment 


As specified or furnished by manufacturers of listed equipment 
(Sections 503.4.1, 503.4.2) 


Incinerators, indoors 


Chimney (Section 503.5) 


Incinerators, outdoors 


Single-wall metal pipe (Sections 503.7, 503.7.6) 


Equipment which may be converted to use of solid fuel 


Chimney (Section 503.5) 


Unlisted combination gas and oil-burning equipment 


Chimney (Section 503.5) 


Listed combination gas and oil-burning equipment 


Type L vent (Section 503.6) or chimney (Section 503.5) 


Combination gas and solid fuel-burning equipment 


Chimney (Section 503.5) 


Equipment listed for use with chimneys only 


Chimney (Section 503.5) 


Unlisted equipment 


Chimney (Section 503.5) 


Decorative appliance in vented fireplace 


Chimney 


Gas-fired toilets 


Single-wall metal pipe (Section 625) 


Direct vent equipment 


See Section 503.2.3 


Equipment with integral vent 


See Section 503.2.4 



tance of 10 feet (3048 mm) (see Figure 503.5.4). Chintmeys 
for medium-heat equipment shall extend at least 10 feet 
(3048 mm) higher than any portion of any building within 25 
feet (7620 mm). Chimneys shall extend at least 5 feet (1524 
mm) above the highest connected equipment draft hood out- 
let or flue collar. Decorative shrouds shall not be installed at 
the termination of factory-built chimneys except where such 
shrouds are listed and labeled for use with the specific fac- 
tory-built chimney system and are installed in accordance 
with the manufacturers' installation instructions. 

503.5.5 Size of chimneys. The effective area of a chimney 
venting system serving listed appliances with draft hoods, 
Category I appliances, and other appliances listed for use 
with Type B vents shall be determined in accordance with 
one of the following methods: 

1. The provisions of Section 504. 

2. For sizing an individual chimney venting system for a 
single appliance with a draft hood, the effective areas 
of the vent connector and chimney flue shall be not 
less than the area of the appliance flue collar or draft 



hood outlet, nor greater than seven times the draft 
hood outlet area. 

3 . For sizing a chimney venting system connected to two 
appliances with draft hoods, the effective area of the 
chimney flue shall be not less than the area of the 
larger draft hood outlet plus 50 percent of the area of 
the smaller draft hood outlet, nor greater than seven 
times the smallest draft hood outlet area. 

4. Chimney venting systems using mechanical draft 
shall be sized in accordance with approved engineer- 
ing methods. 

503.5.5.1 Incinerator venting. Where an incinerator is 
vented by a chimney serving other gas utilization equip- 
ment, the gas input to the incinerator shall not be in- 
cluded in calculating chimney size, provided the 
chimney flue diameter is not less than 1 inch (25 mm) 
larger in equivalent diameter than the diameter of the in- 
cinerator flue outlet. 

503.5.6 Inspection of chimneys. Before replacing an exist- 
ing appliance or connecting a vent connector to a chimney, 
the chimney passageway shall be examined to ascertain that 



70 



FUEL GAS CODE OF NEW YORK STATE 



CHIMWEYS AMD VENTS 




CHIMNEY 



1^ 

CHIMNEY 




A. TERMINATION 10 FT OR LESS FROM RIDGE, WALL, OR PARAPET 



WALL OR 
PARAPET 



AH- 



NOTE: NO HEIGHT 

ABOVE PARAPET 

REQUIRED WHEN 

DISTANCE FROM WALLS 

OR PARAPET IS MORE CHIMNEY 

THAN 10 FT 



1^ 



3 FT 
MIN 




HEIGHT ABOVE 
ANY ROOF 
SURFACE WITHIN 
10 FT HORIZONTALLY 



3 FT 
MIN. 



^ 



CHIMNEY X 



B. TERMINATION MORE THAN 10 FT FROM RIDGE, WALL, OR PARAPET 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

RGURE 503.5.4 



CHIMNEYS AND S8NGLE-WALL METAL PIP 
RESDDENTDAL-TYPE AND LOW-HEAT E 



S SERVING 
MENT 



it is clear and free of obstructions and it shall be cleaned if 
previously used for venting solid or liquid fuel-burning ap- 
pliances or fireplaces. 

S(ID3o5<,6ol CInBinniEey Imlmgo Chimneys shall be lined in 
accordance with NFPA 211. 



ni; Existing chimneys shall be permitted to 
have their use continued when an appliance is re- 
placed by an appliance of similar type, input rating 
and efficiency. 



i. Cleanouts shall be examined to de- 
termine if they will remain tightly closed when not in 
use. 



fs. Where inspection reveals 
that an existing chimney is not safe for the intended ap- 
plication, it shall be repaired, rebuilt, lined, relined or re- 
placed with a vent or chimney to conform to NFPA 211 
and it shall be suitable for the equipment to be vented. 

S03.5.7 dhnmineys servimig eqmnpmenlt tarenmig other fe- 
els. Chimneys serving equipment burning other fuels shall 
comply with Sections 503.5.7.1 through 503.5.7.4. 



5(ID3.5.7.1 SoISd faiiel-lbermiiig appliamces. Gas utiliza- 
tion equipment shall not be connected to a chimney flue 
serving a separate appUance designed to burn solid fuel. 



5®3Jo7o2 LnqinM IFuel-lbiinrmmg appliamices. Where one 
chimney flue serves gas utilization equipment and equip- 
ment burning liquid fuel, the equipment shall be con- 
nected through separate openings or shall be connected 
through a single opening where joined by a suitable fit- 
ting located as close as practical to the chimney. Where 
two or more openings are provided into one chimney 
flue, they shall be at different levels. Where the gas utili- 
zation equipment is automatically controlled, it shall be 
equipped with a safety shutoff device. 

S(ID3o5o73 ComblEatnoini gas and solM ffmel-lburiiliig ap= 
pMamces. A combination gas- and solid fuel-burning ap- 
pliance shall be permitted to be connected to a single 
chimney flue where equipped with a manual reset device 
to shut off gas to the main burner in the event of sustained 
backdraft or flue gas spillage. The chimney flue shall be 
sized to properly vent the appliance. 

5(D)3.5o7»4 Combimatnoini gas= aed ml ffimel-lbiiiirnmg ap= 
pllamceSo A listed combination gas- and oil fuel-burning 
appliance shall be permitted to be connected to a single 
chimney flue. The chimney flue shall be sized to prop- 
erly vent the appliance. 



All portions of chimneys 
shall be supported for the design and weight of the materials 
employed. Factory-built chimneys shall be supported and 
spaced in accordance with their listings and the manufac- 
turer's instructions. 



i. Where a chimney that formerly carried 
flue products from liquid or solid fuel-burning appliances is 
used with an appliance using fuel gas, an accessible 
cleanout shall be provided. The cleanout shall have a 
tight-fitting cover and shall be installed so its upper edge is 



FUEL GAS CODE OF NEW YORK STATE 



71 



CHIMNEYS AND VENTS 



at least 6 inches (152 mm) below the lower edge of the low- 
est chimney inlet opening. 

503.5.10 Space surrounding lining or vent. The remain- 
ing space surrounding a chimney liner, gas vent, special gas 
vent or plastic piping installed within a masonry chimney 
flue shall not be used to vent another appliance. The inser- 
tion of another liner or vent within the chimney as provided 
in this code and the liner or vent manufacturer's instructions 
shall not be prohibited. 

The remaining space surrounding a chimney liner, gas 
vent, special gas vent or plastic piping installed within a ma- 
sonry, metal or factory-built chimney, shall not be used to 
supply combustion air. Such space shall not be prohibited 
from supplying combustion air to direct- vent appliances de- 
signed for installation in a solid fuel-burning fireplace and 
installed in accordance with the listing and the manufac- 
turer's instructions. 

503.6 Gas vents. Gas vents shall comply with Sections 503.6. 1 
through 503.6.12 (see Section 202, Definitions). 

503.6.1 Installation, general. Gas vents shall be installed 
in accordance with the terms of their listings and the manu- 
facturer's instructions. 

503.6.2 Type B-W vent capacity. A Type B-W gas vent 
shall have a listed capacity not less than that of the listed 
vented wall furnace to which it is connected. 

503.6.3 Roof penetration. A gas vent passing through a 
roof shall extend through the roof flashing, roof jack or roof 
thimble and shall be terminated by a listed termination cap. 

503.6.4 Offsets. Type B and Type L vents shall extend in a 
generally vertical direction with offsets not exceeding 45 
degrees (0.79 rad), except that a vent system having not 
more than one 60-degree (1.04 rad) offset shall be permit- 
ted. Any angle greater than 45 degrees (0.79 rad) from the 
vertical is considered horizontal. The total horizontal length 
of a vent plus the horizontal vent connector length serving 
draft-hood-equipped appliances shall not be greater than 75 
percent of the vertical height of the vent. 

Exception: Systems designed and sized as provided in 
Section 504 or in accordance with other approved engi- 
neering methods. 

Vents serving Category I fan-assisted appliances shall be 
installed in accordance with the appliance manufacturer's 
instructions and Section 504 or other approved engineering 
methods. 

503.6.5 Gas vents installed vdthin masonry chimneys. Gas 

vents installed within masonry chimneys shall be installed in 
accordance with the terms of their listing and the manufac- 
turer's installation instructions. Gas vents installed within 
masonry chimneys shall be identified with a permanent label 
installed at the point where the vent enters the chimney. The 
label shall contain the following language: "This gas vent is 
for appliances that bum gas. Do not connect to solid or hquid 
fuel-burning appliances or incinerators." 

503.6.6 Gas vent terminations. A gas vent shall terminate 
in accordance with one of the following: 



1 . Above the roof surface with a listed cap or listed roof 
assembly. Gas vents 12 inches (305 mm) in size or 
smaller with listed caps shall be permitted to be termi- 
nated in accordance with Figure 503.6.6, provided 
that such vents are at least 8 feet (2438 mm) from a 
vertical wall or similar obstruction. All other gas 
vents shall terminate not less than 2 feet (610 mm) 
above the highest point where they pass through the 
roof and at least 2 feet (610 mm) higher than any por- 
tion of a building within 10 feet (3048 mm). 

2. As provided for industrial equipment in Section 
503.2.2. 

3. As provided for direct-vent systems in Section 
503.2.3. 

4. As provided for equipment with integral vents in Sec- 
tion 503.2.4. 

5. As provided for mechanical draft systems in Section 
503.3.3. 



LOWEST DISCHARGE 
OPENING 



LISTED GAS 
VENT 




H (MIN.) - 

MINIMUM HEIGHT FROM ROOF 

TO LOWEST DISCHARGE OPENING 



ROOF PITCH 


H (min) ft 


Flat to 6/12 


1.0 


Over 6/12 to 7/12 


1.25 


Over 7/12 to 8/12 


1.5 


Over 8/12 to 9/12 


2.0 


Over 9/12 to 10/12 


2.5 


Over 10/12 to 11/12 


3.25 


Over 11/12 to 12/12 


4.0 


Over 12/12 to 14/12 


5.0 


Over 14/12 to 16/12 


6.0 


Over 16/12 to 18/12 


7.0 


Over 18/12 to 20/12 


7.5 


Over 20/12 to 21/12 


8.0 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE 503.6.6 

GAS VENT TERMINATION LOCATIONS FOR 

LISTED CAPS 12 INCHES OR LESS IN SIZE AT 

LEAST 8 FEET FROM A VERTICAL WALL 



72 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 



6. As provided for ventilating hoods and exhaust sys- 
tems in Section 503.3.4. 

5®3.6.6 J Decorative shrouds. Decorative shrouds shall 
not be installed at the termination of gas vents except 
where such shrouds are listed for use with the specific 
gas venting system and are installed in accordance with 
manufacturer's installation instructions. 



503.6.7 MioimMm helglrt. A Type B or a Type L gas vent 
shall terminate at least 5 feet (1524 mm) in vertical height 
above the highest connected equipment draft hood or flue 
collar. A Type B-W gas vent shall terminate at least 12 feet 
(3658 mm) in vertical height above the bottom of the wall 
furnace. 



5. A gas vent extending 
through an exterior wall shall not terminate adjacent to the 
wall or below eaves or parapets, except as provided in Sec- 
tions 503.2.3 and 503.3.3. 

503.6.9 SSze off gas veets. Venting systems shall be sized 
and constructed in accordance with Section 504 or other ap- 
proved engineering methods and the gas vent and gas equip- 
ment manufacturers' instructions. 



503.6.9.1 Category I appliances. The sizing of natural 
draft venting systems serving one or more listed appli- 
ances equipped with a draft hood or appliances listed for 
use with Type B gas vent, installed in a single story of a 
building, shall be in accordance with one of the following 
methods: 

1 . The provisions of Section 504. 

2. For sizing an individual gas vent for a single, 
draft-hood-equipped appliance, the effective 
area of the vent connector and the gas vent shall 
be not less than the area of the appliance draft 
hood outlet, nor greater than seven times the 
draft hood outlet area. 

3. For sizing a gas vent connected to two appli- 
ances with draft hoods, the effective area of the 
vent shall be not less than the area of the larger 
draft hood outlet plus 50 percent of the area of 
the smaller draft hood outlet, nor greater than 
seven times the smaller draft hood outlet area. 

4. Approved engineering practices. 

503.6.9.2 Category II, III, and IV appliances. The siz- 
ing of gas vents for Category II, III, and IV equipment 
shall be in accordance with the equipment manufac- 
turer's instructions. 



L Chimney venting systems 
using mechanical draft shall be sized in accordance with 
approved engineering methods. 



5' 



,6.10 Gas ventts serving equipment on more than one 
• A single or common gas vent shall be permitted in 
multistory installations to vent Category I equipment lo- 
cated on more than one floor level, provided the venting sys- 
tem is designed and installed in accordance with this section 
and approved engineering methods. 

503.6.10.1 Equipment separation. All equipment con- 
nected to the common vent shall be located in rooms sep- 



arated from habitable space. Each of these rooms shall 
have provisions for an adequate supply of combustion, 
ventilation and dilution air that is not supplied from hab- 
itable space (see Figure 503.6.10.1). 

503.6.10,2 Sizing. The size of the connectors and com- 
mon segments of multistory venting systems for equip- 
ment listed for use with Type B double-wall gas vent 
shall be in accordance with Table 504.3(1) and Figures 
B-13 and B-14 in Appendix B, provided: 



1. 



The available total height (H) for each segment of 
a multistory venting system is the vertical dis- 
tance between the level of the highest draft hood 
outlet or flue collar on that floor and the center- 
line of the next highest interconnection tee (see 
Figure B-13). 

The size of the connector for a segment is deter- 
mined from its gas utilization equipment heat in- 
put and available connector rise, and shall not be 
smaller than the draft hood outlet or flue collar 
size. 

The size of the common vertical segment, and of 
the interconnection tee at the base of that segment, 
shall be based on the total gas utilization equip- 
ment heat input entering that segment and its avail- 
able total height. 



Gas vents shall be sup- 
ported and spaced in accordance with their listings and the 
manufacturer's instructions. 



Bg. In those localities where solid and hq- 
uid fuels are used extensively, gas vents shall be perma- 
nently identified by a label attached to the wall or ceiling at a 



GAS FURNACE- 



c 



OUTLET PLENUM 



f 




- TYPE B GAS VENTS 



AIR GRILLS IN 
OUTSIDE WALL 



OUTSIDE BALCONY 
OR SERVICE AREA 



U 



- LOUVERED DOOR PERMITTED 
TO BE USED IN LIEU OF 
OUTSIDE WALL GRILLS 



FIGURE 503.6.10.11 
VIEW OF PRACTSCAL SEPARATION METHOD 
FOR R/iULTSSTORY GAS VENTING 



FUEL GAS CODE OF NEW YORK STATE 



73 



CHIMNEYS AND VENTS 



point where the vent connector enters the gas vent. The label 
shall read: 

"This gas vent is for appliances that bum gas. Do not con- 
nect to solid or liquid fuel-burning appliances or incinera- 
tors." 

503.7 Single-wall metal pipe. Single-wall metal pipe vents 
shall comply with Sections 503.7.1 through 503.7.12. 

503.7.1 Construction. Single-wall metal pipe shall be con- 
structed of galvanized sheet steel not less than 0.0304 inch 
(0.7 mm) thick, or other approved, noncombustible corro- 
sion-resistant material. 

503.7.2 Cold climate. Uninsulated single-wall metal pipe 
shall not be used outdoors in cold climates for venting gas 
utilization equipment. 

503.7.3 Termination. Single-wall metal pipe shall termi- 
nate at least 5 feet (1524 mm) in vertical height above the 
highest connected equipment draft hood outlet or flue col- 
lar. Single-wall metal pipe shall extend at least 2 feet (610 
mm) above the highest point where it passes through a roof 
of a building and at least 2 feet (610 mm) higher than any 
portion of a building within a horizontal distance of 10 feet 
(3048 mm) (see Figure 503.5.4). An approved cap or roof 
assembly shall be attached to the terminus of a single-wall 
metal pipe (see also Section 503.7.8, Item 3). 

503.7.4 Limitations of use. Single- wall metal pipe shall be 
used only for runs directly from the space in which the 
equipment is located through the roof or exterior wall to the 
outdoor atmosphere. 

503.7.5 Roof penetrations. A pipe passing through a roof 
shall extend without interruption through the roof flashing, 
roof jack, or roof thimble. Where a single-wall metal pipe 
passes through a roof constructed of combustible material, a 
noncombustible, nonventilating thimble shall be used at the 
point of passage. The thimble shall extend at least 18 inches 
(457 mm) above and 6 inches (152 mm) below the roof with 
the annular space open at the bottom and closed only at the 



top. The thimble shall be sized in accordance with Section 
503.10.16. 

503.7.6 Installation. Single-wall metal pipe shall not origi- 
nate in any unoccupied attic or concealed space and shall not 
pass through any attic, inside wall, concealed space or floor. 
The installation of a single- wall metal pipe through an exte- 
rior combustible wall shall comply with Section 503.10.15. 
Single-wall metal pipe used for venting an incinerator shall 
be exposed and readily examinable for its full length and 
shall have suitable clearances maintained. 

503.7.7 Clearances. Minimum clearances from single-wall 
metal pipe to combustible material shall be in accordance 
with Table 503.7.7. The clearance from single-wall metal 
pipe to combustible material shall be permitted to be re- 
duced where the combustible material is protected as speci- 
fied for vent connectors in Table 308.2. 

503.7.8 Size of single-wall metal pipe. A venting system 
constructed of single- wall metal pipe shall be sized in accor- 
dance with one of the following methods and the equipment 
manufacturer's instructions: 

1 . For a draft-hood-equipped apphance, in accordance 
with Section 504. 

2. For a venting system for a single appliance with a 
draft hood, the areas of the connector and the pipe 
each shall be not less than the area of the appliance 
flue collar or draft hood outlet, whichever is smaller. 
The vent area shall not be greater than seven times the 
draft hood outlet area. 

3. Other approved engineering methods. 

503.7.9 Pipe geometry. Any shaped single-wall metal pipe 
shall be permitted to be used, provided that its equivalent ef- 
fective area is equal to the effective area of the round pipe for 
which it is substituted, and provided that the minimum inter- 
nal dimension of the pipe is not less than 2 inches (5 1 mm). 



TABLE 503.7.7^ 
CLEARANCES FOR CONNECTORS 



EQUIPMENT 


MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL 


Listed Type B gas 
vent material 


Listed Type L 
vent material 


Single-wall 
metal pipe 


Factory-built 
chimney sections 


Listed equipment with draft hoods and equipment listed for 
use with Type B gas vents 


As listed 


As listed 


6 inches 


As listed 


Residential boilers and furnaces with listed gas conversion 
burner and with draft hood 


6 inches 


6 inches 


9 inches 


As listed 


Residential appliances listed for use with Type L vents 


Not permitted 


As listed 


9 inches 


As listed 


Listed gas-fired toilets 


Not permitted 


As listed 


As listed 


As listed 


Unlisted residential appliances with draft hood 


Not permitted 


6 inches 


9 inches 


As listed 


Residential and low-heat equipment other than above 


Not permitted 


9 inches 


18 inches 


As listed 


Medium-heat equipment 


Not permitted 


Not permitted 


36 inches 


As listed 



For SI: 1 inch - 25.4 mm. 

a. These clearances shall apply unless the listing of an appliance or connector specifies different clearances, in which case the listed clearances shall apply. 



74 



FUEL GAS CODE OF NEW YORK STATE 



CHIMSMEYS AMD VEMTS 



503o7ol0 Termmatlon capacity., The vent cap or a roof as- 
sembly shall have a venting capacity not less than that of the 
pipe to which it is attached. 

503.7«11 Support off §lmgle=wall metal pnpe. All portions 
of single-wall metal pipe shall be supported for the design 
and weight of the material employed. 



5©3.7ol2 Marknmgo Single- wall metal pipe shall comply 
with the marking provisions of Section 503.6.12. 



_ system termnmatloim locatloE, The location of 
venting system terminations shall comply with the following 
and Figure 503.8: 

1. A mechanical draft venting system shall terminate at 
least 3 feet (914 mm) above any forced-air inlet located 
within 10 feet (3048 mm). 

mnsi 



2. 



1. This provision shall not apply to the combus- 
tion air intake of a direct- vent appliance. 

2. This provision shall not apply to the separation 
of the integral outdoor air inlet and flue gas dis- 
charge of listed outdoor appliances. 

A mechanical draft venting system, excluding di- 
rect-vent appliances, shall terminate at least 4 feet (1219 
mm) below, 4 feet (1219 mm) horizontally from, or 1 



foot (305 mm) above any door, operable window or 
gravity air inlet into any building. The bottom of the vent 
terminal shall be located at least 12 inches (305 mm) 
above grade. 

3 . The vent terminal of a direct- vent appliance with an input 
of 10,000 Btu per hour (3 kW) or less shall be located at 
least 6 inches (152 mm) from any air opening into a 
building, and such an appliance with an input over 
10,000 Btu per hour (3 kW) but not over 50,000 Btu per 
hour (14.7 kW) shall be installed with a 9-inch (230 nmi) 
vent termination clearance, and an appliance with an in- 
put over 50,000 Btu/h (14.7 kw) shall have at least a 
12-inch (305 mm) vent termination clearance. The bot- 
tom of the vent terminal and the air intake shall be lo- 
cated at least 12 inches (305 mm) above grade. 

4. Through-the-wall vents for Category II and IV appli- 
ances and noncategorized condensing appliances shall 
not terminate over public walkways or over an area 
where condensate or vapor could create a nuisance or 
hazard or could be detrimental to the operation of regula- 
tors, relief valves, or other equipment. Where local expe- 
rience indicates that condensate is a problem with 
Category I and III appliances, this provision shall also 
apply. 



DIRECT-VENT TERMINAL CLEARANCE 
MINIMUM CLEARANCE, C 



INPUT (BTU/HR) 

10.000 OR LESS 

10.001 TO 50,000 
OVER 50,000 



CLEARANCE (IN.) 
6 
9 
12 



[SEE SECTION 503.8, ITEM 3] 




MECHANICAL DRAFT 

VENT TERMINAL 

[SEE SECTION 503.8, ITEM 1] 



FORCED-AIR INLET 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W 



FIGURE 503.8 
EXBT TERSV3DMALS OF MECHAMICAL DRAFT AND D8RECT-VENT SYSTEP 



FUEL GAS CODE OF NEW Y0R5C STATE 



75 



CHIMNEYS AND VENTS 



503.9 Condensation drainage. Provision shall be made to col- 
lect and dispose of condensate from venting systems serving 
Category II and IV equipment and noncategorized condensing 
appliances in accordance with Section 503.8, Item 4. Where lo- 
cal experience indicates that condensation is a problem, provi- 
sion shall be made to drain off and dispose of condensate from 
venting systems serving Category I and III equipment in accor- 
dance with Section 503.8, Item 4. 

503.10 Vent connectors for Category I equipment. Vent con- 
nectors for Category I equipment shall comply with Sections 
503.10.1 through 503. 10. 16. 

503.10.1 Where required. A vent connector shall be used 
to connect equipment to a gas vent, chimney or single- wall 
metal pipe, except where the gas vent, chimney or sin- 
gle-wall metal pipe is directly connected to the equipment. 

503.10.2 Materials. Vent connectors shall be constructed in 
accordance with Sections 503.10.2.1 through 503.10.2.5. 

503.10.2.1 General. A vent connector shall be made of 
noncombustible corrosion-resistant material capable of 
withstanding the vent gas temperature produced by the 
equipment and of sufficient thickness to withstand phys- 
ical damage. 

503.10.2.2 Vent connectors located in unconditioned 
areas. Where the vent connector used for equipment 
having a draft hood or a Category I appliance is located in 
or passes through attics, crawl spaces or other uncondi- 
tioned spaces, that portion of the vent connector shall be 
listed Type B or Type L or listed vent material or listed 
material having equivalent insulation properties. 

Exception: Single- wall metal pipe shall not be lo- 
cated in unconditioned spaces other than attics and 
crawl spaces. 

503.10.2.3 Residential-type appliance connectors. 

Where vent connectors for residential-type appliances 
are not installed in attics or other unconditioned spaces, 
connectors for listed appliances having draft hoods and 
for appliances having draft hoods and equipped with 
listed conversion burners shall be one of the following: 

1 . Type B or Type L vent material; 

2. Galvanized sheet steel not less than 0.018 inch 
(0.46 mm) thick; 

3. Aluminum (1100 or 3003 alloy or equivalent) 
sheet not less than 0.027 inch (0.69 mm) thick; 

4. Stainless steel sheet not less than 0.012 inch (0.31 
mm) thick; 

5. Smooth interior wall metal pipe having resistance 
to heat and corrosion equal to or greater than that 
of Item 2, 3 or 4 above; or 

6. A Hsted vent connector. 

Vent connectors shall not be covered with insulation. 

Exception: Listed insulated vent connectors shall be 
installed according to the terms of their listing. 

503.10.2.4 Low-heat equipment. A vent connector for 
low-heat equipment shall be a factory-built chimney sec- 
tion or steel pipe having resistance to heat and corrosion 



equivalent to that for the appropriate galvanized pipe as 
specified in Table 503.10.2.4. Factory-built chimney 
sections shall be joined together in accordance with the 
chimney manufacturers' instructions. 

TABLE 503.10.2.4 

MINIMUM THICKNESS FOR GALVANIZED STEEL VENT 

CONNECTORS FOR LOW-HEAT APPLIANCES 



DIAMETER OF CONNECTOR 
(inches) 


MINIMUM THICKNESS 
(Inch) 


Less than 6 


0.019 


6 to less than 10 


0.023 


10 to 12 inclusive 


0.029 


14 to 16 inclusive 


0.034 


Over 16 


0.056 



For SI: 1 inch = 25.4 mm. 

503.10.2,5 Medium-heat appliances. Vent connectors 
for medium-heat equipment and commercial and indus- 
trial incinerators shall be constructed of factory-built me- 
dium-heat chimney sections or steel of a thickness not 
less than that specified in Table 503.10.2.5 and shall 
comply with the following: 

1. A steel vent connector for equipment with a vent 
gas temperature in excess of 1000°F (538°C), 
measured at the entrance to the connector shall be 
lined with medium-duty fire brick (ASTM C 64, 
Type F), or the equivalent. 

2. The lining shall be at least 2'/2 inches (64 mm) 
thick for a vent connector having a diameter or 
greatest cross-sectional dimension of 18 inches 
(457 mm) or less. 

3. The lining shall be at least 472 inches (114 mm) 
thick laid on the 4'/2-inch (1 14 mm) bed for a vent 
connector having a diameter or greatest cross-sec- 
tional dimension greater than 1 8 inches (457 mm). 

4. Factory-built chimney sections, if employed, shall 
be joined together in accordance with the chimney 
manufacturers' instructions. 

TABLE 503.10.2.5 

MINIMUM THICKNESS FOR STEEL VENT CONNECTORS FOR 

MEDIUM-HEAT EQUIPMENT AND COMMERCIAL AND 

INDUSTRIAL INCINERATORS VENT CONNECTOR SIZE 



DIAMETER 
(inches) 


AREA 
(square inches) 


MINIMUM THICKNESS 
(inch) 


Up to 14 


Up to 154 


0.053 


Over 14 to 16 


154 to 201 


0.067 


Over 16 to 18 


201 to 254 


0.093 


Over 18 


Larger than 254 


0.123 



For SI: 1 inch = 25.4 mm, 1 square inch - 645.16 mm^. 

503.10.3 Size of vent connector. Vent connectors shall be 
sized in accordance with Sections 503.10.3.1 through 
503.10.3.5. 

503.10.3.1 Single draft hood and fan-assisted. A vent 
connector for equipment with a single draft hood or for a 
Category I fan-assisted combustion system appliance 



76 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AIMD VENTS 



shall be sized and installed in accordance with Section 
504 or other approved engineering methods. 



5€)3o]l®.3.2 Mmltlple draft hood. For a single appliance 
having more than one draft hood outlet or flue collar, the 
manifold shall be constructed according to the instruc- 
tions of the appliance manufacturer. Where there are no 
instructions, the manifold shall be designed and con- 
structed in accordance with approved engineering prac- 
tices. As an alternate method, the effective area of the 
manifold shall equal the combined area of the flue collars 
or draft hood outlets and the vent connectors shall have a 
minimum 1-foot (305 mm) rise. 



i. Where two or more ap- 
pliances are connected to a common vent or chimney, 
each vent connector shall be sized in accordance with 
Section 504 or other approved engineering methods. 

As an alternative method applicable only when all of 
the appliances are draft hood equipped, each vent con- 
nector shall have an effective area not less than the area of 
the draft hood outlet of the appliance to which it is 
connected. 



Where two 

or more gas appliances are vented through a common 
vent connector or vent manifold, the common vent con- 
nector or vent manifold shall be located at the highest 
level consistent with available headroom and the re- 
quired clearance to combustible materials and shall be 
sized in accordance with Section 504 or other approved 
engineering methods. 

As an alternate method applicable only where there 
are two draft hood equipped appliances, the effective 
area of the common vent connector or vent manifold and 
all junction fittings shall be not less than the area of the 
larger vent connector plus 50 percent of the area of the 
smaller flue collar outlet. 

SOSoldDoSoS Snze mcrease. Where the size of a vent con- 
nector is increased to overcome installation limitations 
and obtain connector capacity equal to the equipment in- 
put, the size increase shall be made at the equipment draft 
hood outlet. 

503.1(IDo4 Two or more applSaimces comimeclted to a snimgle 
veet. Where two or more vent connectors enter a common 
gas vent, chimney flue, or single-wall metal pipe, the 
smaller connector shall enter at the highest level consistent 
with the available headroom or clearance to combustible 
material. Vent connectors serving Category I appliances 
shall not be connected to any portion of a mechanical draft 
system operating under positive static pressure, such as 
those serving Category III or IV appliances. 

503oMD.5 Clearamceo Minimum clearances from vent con- 
nectors to combustible material shall be in accordance with 
Table 503.7.7. 



m: The clearance between a vent connector and 
combustible material shall be permitted to be reduced 
where the combustible material is protected as specified 
for vent connectors in Table 308.2. 



5®3.1(IDo6 Flow resnstamcSo A vent connector shall be in- 
stalled so as to avoid turns or other construction features that 
create excessive resistance to flow of vent gases. 

S®3.1([Do7 JonmtSo Joints between sections of connector pip- 
ing and connections to flue collars and hood outlets shall be 
fastened by one of the following methods: 

1. Sheet metal screws. 

2. Vent connectors of listed vent material assembled and 
connected to flue collars or draft hood oudets in ac- 
cordance with the manufacturers' instructions. 



A vent connector shall be installed without 
dips or sags and shall slope upward toward the vent or chim- 
ney at least ^1^ inch per foot (21 mm/m). 

Exceptiom: Vent connectors attached to a mechanical 
draft system installed in accordance with the manufac- 
turers' instructions. 



A vent connector shall 
be as short as practical and the equipment located as close as 
practical to the chimney or vent. Except as provided for in 
Secfion 503.10.3, the maximum horizontal length of a sin- 
gle-wall connector shall be 75 percent of the height of the 
chimney or vent. Except as provided for in Section 
503. 10.3, the maximum horizontal length of a Type B dou- 
ble-wall connector shall be 100 percent of the height of the 
chimney or vent. For a chimney or vent system serving mul- 
tiple appliances, the maximum length of an individual con- 
nector, from the appliance oudet to the junction with the 
common vent or another connector, shall be 100 percent of 
the height of the chimney or vent. 



, A vent connector shall be supported for 
the design and weight of the material employed to maintain 
clearances and prevent physical damage and separation of 
joints. 

5®3<.l([D.ll ClhliniiEey comniecltSom. Where entering a flue in a 
masonry or metal chimney, the vent connector shall be in- 
stalled above the extreme bottom to avoid stoppage. Where 
a thimble or slip joint is used to facilitate removal of the con- 
nector, the connector shall be firmly attached to or inserted 
into the thimble or slip joint to prevent the connector from 
falling out. Means shall be employed to prevent the connec- 
tor from entering so far as to restrict the space between its 
end and the opposite wall of the chimney flue (see Section 
501.9). 

503ol(IDol2 Emspectiomo The entire length of a vent connector 
shall be provided with ready access for inspection, cleaning 
and replacement. 



laces. A vent connector shall not be con- 
nected to a chimney flue serving a fireplace unless the fire- 
place flue opening is permanently sealed. 



5(D)3ol(D).l4 Passage Utironiglii ceilnegs, loors, or wallSo A 
vent connector shall not pass through any ceiling, floor or 
fire-resistance-rated wall . A single-wall metal pipe connec- 
tor shall not pass through any interior wall. 

Exceptioms Vent connectors made of listed Type B or 
Type L vent material and serving listed equipment with 
draft hoods and other equipment listed for use with Type 



FUEL GAS CODE OF NEW YORK STATE 



77 



CHIMNEYS AND VENTS 



B gas vents shall be permitted to pass through walls or 
partitions constructed of combustible material if the con- 
nectors are installed with not less than the listed clear- 
ance to combustible material. 

503.10.15 Single-wall connector penetrations of com= 
bustible walls. A vent connector made of a single-wall 
metal pipe shall not pass through a combustible exterior 
wall unless guarded at the point of passage by a ventilated 
metal thimble not smaller than the following: 

1 . For listed appliances equipped with draft hoods and 
appliances listed for use with Type B gas vents, the 
thimble shall be not less than 4 inches (102 mm) 
larger in diameter than the vent connector. Where 
there is a run of not less than 6 feet ( 1 829 mm) of vent 
connector in the open between the draft hood outlet 
and the thimble, the thimble shall be permitted to be 
not less than 2 inches (5 1 mm) larger in diameter than 
the vent connector. 

2. For unhsted appliances having draft hoods, the thim- 
ble shall be not less than 6 inches (152 mm) larger in 
diameter than the vent connector. 

3. For residential and low-heat appliances, the thimble 
shall be not less than 12 inches (305 mm) larger in di- 
ameter than the vent connector. 

Exception: In lieu of thimble protection, all combustible 
material in the wall shall be removed from the vent con- 
nector a sufficient distance to provide the specified clear- 
ance from such vent connector to combustible material. 
Any material used to close up such opening shall be 
noncombustible. 

503.10.16 Medium-heat connectors. Vent connectors for 
medium-heat equipment shall not pass through walls or par- 
titions constructed of combustible material. 

503.11 Vent connectors for Category II, III and IV appli- 
ances. Vent connectors for Category 11, III and IV appliances 
shall be as specified for the venting systems in accordance with 
Section 503.4. 

503.12 Draft hoods and draft controls. The installation of 
draft hoods and draft controls shall comply with Sections 
503.12.1 through 503.12.7. 

503.12.1 Equipment requiring draft hoods. Vented 
equipment shall be installed with draft hoods. 

Exception: Dual oven-type combination ranges, incin- 
erators, direct-vent equipment, fan-assisted combustion 
system appliances, equipment requiring chimney draft 
for operation, single firebox boilers equipped with con- 
version burners with inputs greater than 400,000 Btu per 
hour (1 17 kw), equipment equipped with blast, power, or 
pressure burners that are not listed for use with draft 
hoods, and equipment designed for forced venting. 

503.12.2 Installation. A draft hood supplied with or form- 
ing a part of listed vented equipment shall be installed with- 
out alteration, exactly as furnished and specified by the 
equipment manufacturer. 

503.12.2.1 Draft hood required. If a draft hood is not 
supplied by the equipment manufacturer where one is re- 



quired, a draft hood shall be installed, shall be of a listed 
or approved type and, in the absence of other instruc- 
tions, shall be of the same size as the equipment flue col- 
lar. Where a draft hood is required with a conversion 
burner, it shall be of a listed or approved type. 

503.12.2o2 Special design draft hood. Where it is deter- 
mined that a draft hood of special design is needed or 
preferable for a particular installation, the installation 
shall be in accordance with the recommendations of the 
equipment manufacturer and shall be approved. 

503.12.3 Draft control devices. Where a draft control de- 
vice is part of the equipment or is supplied by the equipment 
manufacturer, it shall be installed in accordance with the 
manufacturers' instructions. In the absence of manufactur- 
ers' instructions, the device shall be attached to the flue col- 
lar of the equipment or as near to the equipment as practical. 

503.12.4 Additional devices. Equipment (except incinera- 
tors) requiring controlled chimney draft shall be permitted 
to be equipped with a listed double-acting barometric-draft 
regulator installed and adjusted in accordance with the man- 
ufacturers' instructions. 

503.12.5 Location. Draft hoods and barometric draft regu- 
lators shall be installed in the same room or enclosure as the 
equipment in such a manner as to prevent any difference in 
pressure between the hood or regulator and the combustion 
air supply. 

503.12.6 Positioning. Draft hoods and draft regulators shall 
be installed in the position for which they were designed 
with reference to the horizontal and vertical planes and shall 
be located so that the relief opening is not obstructed by any 
part of the equipment or adjacent construction. The equip- 
ment and its draft hood shall be located so that the relief 
opening is accessible for checking vent operation. 

503.12.7 Clearance. A draft hood shall be located so its re- 
lief opening is not less than 6 inches (152 mm) from any sur- 
face except that of the equipment it serves and the venting 
system to which the draft hood is connected. Where a 
greater or lesser clearance is indicated on the equipment la- 
bel, the clearance shall be not less than that specified on the 
label. Such clearances shall not be reduced. 

503.13 Manually operated dampers. A manually operated 
damper shall not be placed in the vent connector for any equip- 
ment. Fixed baffles shall not be classified as manually operated | 
dampers. 

503.14 Automatically operated vent dampers. An automati- 
cally operated vent damper shall be of a listed type. 

503.15 Obstructions. Devices that retard the flow of vent I 
gases shall not be installed in a vent connector, chimney or I 
vent. The following shall not be considered as obstructions: I 

1 . Draft regulators and safety controls specifically listed for 
installation in venting systems and installed in accor- 
dance with the terms of their hsting. 

2. Listed heat reclaimers and automatically operated vent 
dampers installed in accordance with the terms of their 
listing. 



78 



FUEL GAS CODE OF NEW YORK STATE 



CHllVJWEYS AND VENTS 



3. Approved economizers, heat reclaimers and recupera- 
tors installed in venting systems of equipment not re- 
quired to be equipped with draft hoods, provided that the 
gas utilization equipment manufacturer's instructions 
cover the installation of such a device in the venting sys- 
tem and performance in accordance with Sections 503.3 
and 503.3.1 is obtained. 

4. Vent dampers serving listed appliances installed in ac- 
cordance with Sections 504.2.1 and 504.3.1. 



imUG OF CATEGORY I APPLIANCI 



BS. The following definitions apply to the ta- 
bles in this section. 



CATEGORIZED VENT 
TER/AREA, The minimum vent area/diameter permissible 
for Category I appliances to maintain a nonpositive vent static 
pressure when tested in accordance with nationally recognized 
standards. 

FAN=ASSISTED COMBUSTION SYSTEM. An appliance 
equipped with an integral mechanical means to either draw or 
force products of combustion through the combustion chamber 
or heat exchanger. 



L The minimum input rating of a Category I fan-as- 
sisted appliance attached to a vent or connector. 

FAN Max. The maximum input rating of a Category I fan-as- 
sisted appliance attached to a vent or connector. 

NAT Max. The maximum input rating of a Category I 
draft-hood-equipped appliance attached to a vent or connector. 

FAN + FAN. The maximum combined apphance input rating 
of two or more Category I fan-assisted appliances attached to 
the common vent. 



+ NAT. The maximum combined appliance input rating 
of one or more Category I fan-assisted appliances and one or 
more Category I draft-hood-equipped appliances attached to 
the common vent. 

NA. Vent configuration is not allowed due to potential for con- 
densate formation or pressurization of the venting system, or 
not applicable due to physical or geometric restraints. 

NAT + NAT. The maximum combined appliance input rating 
of two or more Category I draft-hood-equipped appliances at- 
tached to the common vent. 

504.2 Application of smgle=appllance vemt Tables 504.2(1) 
through 504.2(5). The application of Tables 504.2(1) through 
504.2(5) shall be subject to the requirements of Sections 
504.2.1 through 504.2.15. 

504.2.1 Vent obstrectioms. These venting tables shall not 
be used where obstructions, as described in Section 503. 15, 
are installed in the venting system. The installafion of vents 
serving listed appliances with vent dampers shall be in ac- 
cordance with the appliance manufacturer's instructions or 
in accordance with the following: 



1 . The maximum capacity of the vent system shall be de- 
termined using the "NAT Max" column. 

2. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance, using the 
"FAN Min" column to determine the minimum ca- 
pacity of the vent system. Where the corresponding 
"FAN Min" is "NA," the vent configurarion shall not 
be permitted and an alternative venting configuration 
shall be utilized. 

5CD4.2.2 Mlmimiuiim size. Where the vent size determined 
from the tables is smaller than the appliance draft hood out- 
let or flue collar, the smaller size shall be permitted to be 
used provided that all of the following requirements are 
met: 

1 . The total vent height (H) is at least 10 feet (3048 mm). 

2. Vents for appliance draft hood outlets or flue collars 
12 inches (305 mm) in diameter or smaller are not re- 
duced more than one table size. 

3. Vents for appliance draft hood outlets or flue collars 
larger than 12 inches (305 mm) in diameter are not re- 
duced more than two table sizes. 

4. The maximum capacity listed in the tables for a fan-as- 
sisted apphance is reduced by 10 percent(0.90 x maxi- 
mum table capacity). 

5. The draft hood outlet is greater than 4 inches (102 
mm) in diameter. Do not connect a 3-inch-diameter 
(76 mm) vent to a 4-inch-diameter (102 mm) draft 
hood outiet. This provision shall not apply to fan-as- 
sisted appliances. 



ts. Single-appliance venting configura- 
tions with zero (0) lateral lengths in Tables 504.2(1), 
504.2(2), and 504.2(5) shall not have elbows in the venting 
system. For vent configurations with lateral lengths, the 
venting tables include allowance for two 90-degree (1.57 
rad) turns. For each elbow up to and including 45 degrees 
(0.79 rad), the maximum capacity listed in the venting ta- 
bles shall be reduced by 5 percent. For each elbow greater | 
than 45 degrees (0.79 rad) up to and including 90 degrees 
(1.57 rad), the maximum capacity listed in the venting ta- 
bles shall be reduced by 10 percent. 



Zero (0) lateral (L) shall apply only to 
a straight vertical vent attached to a top outlet draft hood or 
flue collar. 



Sea-level input rat- 
ings shall be used when determining maximum capacity for 
high altitude installation. Actual input (derated for altitude) 
shall be used for determining minimum capacity for high al- 
titude installation. 



SDamces. For appliances 
with more than one input rate, the minimum vent capacity 
(FAN Min) determined from the tables shall be less than the 
lowest apphance input rating, and the maximum vent capac- 
ity (FAN Max/NAT Max) determined from the tables shall 
be greater than the highest apphance rating input. 



FUEL GAS CODE OF NEW YORK STATE 



79 



TABLE 504.2(1) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 
(feet) 


LATERAL 

(Q 

(feet) 


VENT DIAMETER— (D; inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


iVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








78 


46 





152 


86 





251 


141 





375 


205 





524 


285 





698 


370 





897 


470 


2 


13 


51 


36 


18 


97 


67 


27 


157 


105 


32 


232 


157 


44 


321 


217 


53 


425 


285 


63 


543 


370 


4 


21 


49 


34 


30 


94 


64 


39 


153 


103 


50 


227 


153 


66 


316 


211 


79 


419 


279 


93 


536 


362 


6 


25 


46 


32 


36 


91 


61 


47 


149 


100 


59 


223 


149 


78 


310 


205 


93 


413 


273 


110 


530 


354 


8 








84 


50 





165 


94 





276 


155 





415 


235 





583 


320 





780 


415 





1,006 


537 


2 


12 


57 


40 


16 


109 


75 


25 


178 


120 


28 


263 


180 


42 


365 


247 


50 


483 


322 


60 


619 


418 


5 


23 


53 


38 


32 


103 


71 


42 


171 


115 


53 


255 


173 


70 


356 


237 


83 


473 


313 


99 


607 


407 


8 


28 


49 


35 


39 


98 


66 


51 


164 


109 


64 


247 


165 


84 


347 


227 


99 


463 


303 


117 


596 


396 


10 








88 


53 





175 


100 





295 


166 





447 


255 





631 


345 





847 


450 





1,096 


585 


2 


12 


61 


42 


17 


118 


81 


23 


194 


129 


26 


289 


195 


40 


402 


273 


48 


533 


355 


57 


684 


457 


5 


23 


57 


40 


32 


113 


77 


41 


187 


124 


52 


280 


188 


68 


392 


263 


81 


522 


346 


95 


671 


446 


10 


30 


51 


36 


41 J 


104 


70 


54 


176 


115 


67 


267 


175 


88 


376 


245 


104 


504 


330 


122 


651 


427 


15 








94 


58 





191 


112 





327 


187 





502 


285 





716 


390 





970 


525 





1,263 


682 


2 


11 


69 


48 


15 


136 


93 


20 


226 


150 


22 


339 


225 


38 


475 


316 


45 


633 


414 


53 


815 


544 


5 


22 


65 


45 


30 


130 


87 


39 


219 


142 


49 


330 


217 


64 


463 


300 


76 


620 


403 


90 


800 


529 


10 


29 


59 


41 


40 


121 


82 


51 


206 


135 


64 


315 


208 


84 


445 


288 


99 


600 


386 


116 


777 


507 


15 


35 


53 


37 


48 


112 


76 


61 


195 


128 


76 


301 


198 


98 


429 


275 


115 


580 


373 


134 


755 


491 


20 








97 


61 





202 


119 





349 


202 





540 


307 





776 


430 





1,057 


575 





1,384 


752 


2 


10 


75 


51 


14 


149 


100 


18 


250 


166 


20 


377 


249 


33 


531 


346 


41 


711 


470 


50 


917 


612 


5 


21 


71 


48 


29 


143 


96 


38 


242 


160 


47 


367 


241 


62 


519 


337 


73 


697 


460 


86 


902 


599 


10 


28 


64 


44 


38 


133 


89 


50 


229 


150 


62 


351 


228 


81 


499 


321 


95 


675 


443 


112 


877 


576 


15 


34 


58 


40 


46 


124 


84 


59 


217 


142 


73 


337 


217 


94 


481 


308 


HI 


654 


427 


129 


853 


557 


20 


48 


52 


35 


55 


116 


78 


69 


206 


134 


84 


322 


206 


107 


464 


295 


125 


634 


410 


145 


830 


537 



(continued) 



m 



\LE 504.2(1) — conftiniuedl 
DOUBLE-WALL GAS VEWT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 






HEIGHT 

(«; 

(feet) 


LATERAL 

(Q 
(feet) 


VENT DIAIVJETER— (O; inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


iViax 


Min 


MSR 


iVIax 


Mm 


Max 


iVlax 


iVlin 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








100 


64 





213 


128 





374 


220 





587 


336 





853 


475 





1,173 


650 





1,548 


855 


2 


9 


81 


56 


13 


166 


112 


14 


283 


185 


18 


432 


280 


27 


613 


394 


33 


826 


535 


42 


1,072 


700 


5 


21 


77 


54 


28 


160 


108 


36 


275 


176 


45 


421 


273 


58 


600 


385 


69 


811 


524 


82 


1,055 


688 


10 


27 


70 


50 


37 


150 


102 


48 


262 


171 


59 


405 


261 


77 


580 


371 


91 


788 


507 


107 


1,028 


668 


15 


33 


64 


NA 


44 


141 


96 


57 


249 


163 


70 


389 


249 


90 


560 


357 


105 


765 


490 


124 


1,002 


648 


20 


56 


58 


NA 


53 


132 


90 


66 


237 


154 


80 


374 


237 


102 


542 


343 


119 


743 


473 


139 


977 


628 


30 


NA 


NA 


NA 


73 


113 


NA 


88 


214 


NA 


104 


346 


219 


131 


507 


321 


149 


702 


444 


171 


929 


594 


50 








101 


67 





216 


134 





397 


232 





633 


363 





932 


518 





1,297 


708 





1,730 


952 


2 


8 


86 


61 


11 


183 


122 


14 


320 


206 


15 


497 


314 


22 


715 


445 


26 


975 


615 


33 


1,276 


813 


5 


20 


82 


NA 


27 


177 


119 


35 


312 


200 


43 


487 


308 


55 


702 


438 


65 


960 


605 


77 


1,259 


798 


10 


26 


76 


NA 


35 


168 


114 


45 


299 


190 


56 


471 


298 


73 


681 


426 


86 


935 


589 


101 


1,230 


773 


15 


59 


70 


NA 


42 


158 


NA 


54 


287 


180 


66 


455 


288 


85 


662 


413 


100 


911 


572 


117 


1,203 


747 


20 


NA 


NA 


NA 


50 


149 


NA 


63 


275 


169 


76 


440 


278 


97 


642 


401 


113 


888 


556 


131 


1,176 


722 


30 


NA 


NA 


NA 


69 


131 


NA 


84 


250 


NA 


99 


410 


259 


123 


605 


376 


141 


844 


522 


161 


1,125 


670 


100 





NA 


NA 


NA 





218 


NA 





407 


NA 





665 


400 





997 


560 





1,411 


770 





1,908 


1,040 


2 


NA 


NA 


NA 


10 


194 


NA 


12 


354 


NA 


13 


566 


375 


18 


831 


510 


21 


1,155 


700 


25 


1,536 


935 


5 


NA 


NA 


NA 


26 


189 


NA 


33 


347 


NA 


40 


557 


369 


52 


820 


504 


60 


1,141 


692 


71 


1,519 


926 


10 


NA 


NA 


NA 


33 


182 


NA 


43 


335 


NA 


53 


542 


361 


68 


801 


493 


80 


1,118 


679 


94 


1,492 


910 


15 


NA 


NA 


NA 


40 


174 


NA 


50 


321 


NA 


62 


528 


353 


80 


782 


482 


93 


1,095 


666 


109 


1,465 


895 


20 


NA 


NA 


NA 


47 


166 


NA 


59 


311 


NA 


71 


513 


344 


90 


763 


471 


105 


1,073 


653 


122 


1,438 


880 


30 


NA 


NA 


NA 


NA 


NA 


NA 


78 


290 


NA 


92 


483 


NA 


115 


726 


449 


131 


1,029 


627 


149 


1,387 


849 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


147 


428 


NA 


180 


651 


405 


197 


944 


575 


217 


1,288 


787 



(continued) 



> 



TABLE 504.2(1) — continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAMETER— (D) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








1,121 


570 





1,645 


850 





2,267 


1,170 





2,983 


1,530 





3,802 


1,960 





4,721 


2,430 





5,737 


2,950 





6,853 


3,520 


2 


75 


675 


455 


103 


982 


650 


138 


1,346 


890 


178 


1,769 


1,170 


225 


2,250 


1,480 


296 


2,782 


1,850 


360 


3,377 


2,220 


426 


4,030 


2,670 


4 


110 


668 


445 


147 


975 


640 


191 


1,338 


880 


242 


1,761 


1,160 


300 


2,242 


1,475 


390 


2,774 


1,835 


469 


3,370 


2,215 


555 


4,023 


2,660 


6 


128 


661 


435 


171 


967 


630 


219 


1,330 


870 


276 


1,753 


1,150 


341 


2,235 


1,470 


437 


2,767 


1,820 


523 


3,363 


2,210 


618 


4,017 


2,650 


8 








1,261 


660 





1,858 


970 





2,571 


1,320 





3,399 


1,740 





4,333 


2,220 





5,387 


2,750 





6,555 


3,360 





7,838 


4,010 


2 


71 


770 


515 


98 


1,124 


745 


130 


1,543 


1,020 


168 


2,030 


1,340 


212 


2,584 


1,700 


278 


3,196 


2,110 


336 


3,882 


2,560 


401 


4,634 


3,050 


5 


115 


758 


503 


154 


1,110 


733 


199 


1,528 


1,010 


251 


2,013 


1,330 


311 


2,563 


1,685 


398 


3,180 


2,090 


476 


3,863 


2,545 


562 


4,612 


3,040 


8 


137 


746 


490 


180 


1,097 


720 


231 


1,514 


1,000 


289 


2,000 


1,320 


354 


2,552 


1,670 


450 


3,163 


2,070 


537 


3,850 


2,530 


630 


4,602 


3,030 


10 








1,377 


720 





2,036 


1,060 





2,825 


1,450 





3,742 


1,925 





4,782 


2,450 





5,955 


3,050 





7,254 


3,710 





8,682 


4,450 


2 


68 


852 


560 


93 


1,244 


850 


124 


1,713 


1,130 


161 


2,256 


1,480 


202 


2,868 


1,890 


264 


3,556 


2,340 


319 


4,322 


2,840 


378 


5,153 


3,390 


5 


112 


839 


547 


149 


1,229 


829 


192 


1,696 


1,105 


243 


2,238 


1,461 


300 


2,849 


1,871 


382 


3,536 


2,318 


458 


4,301 


2,818 


540 


5,132 


3,371 


10 


142 


817 


525 


187 


1,204 


795 


238 


1,669 


1,080 


298 


2,209 


1,430 


364 


2,818 


1,840 


459 


3,504 


2,280 


546 


4,268 


2,780 


641 


5,099 


3,340 


15 








1,596 


840 





2,380 


1,240 





3,323 


1,720 





4,423 


2,270 





5,678 


2,900 





7,099 


3,620 





8,665 


4,410 





10,393 


5,300 


2 


63 


1,019 


675 


86 


1,495 


985 


114 


2,062 


1,350 


147 


2,719 


1,770 


186 


3,467 


2,260 


239 


4,304 


2,800 


290 


5,232 


3,410 


346 


6,251 


4,080 


5 


105 


1,003 


660 


140 


1,476 


967 


182 


2,041 


1,327 


229 


2,696 


1,748 


283 


3,442 


2,235 


355 


4,278 


2,777 


426 


5,204 


3,385 


501 


6,222 


4,057 


10 


135 


977 


635 


177 


1,446 


936 


227 


2,009 


1,289 


283 


2,659 


1,712 


346 


3,402 


2,193 


432 


4,234 


2,739 


510 


5,159 


3,343 


599 


6,175 


4,019 


15 


155 


953 


610 


202 


1,418 


905 


257 


1,976 


1,250 


318 


2,623 


1,675 


385 


3,363 


2,150 


479 


4,192 


2,700 


564 


5,115 


3,300 


665 


6,129 


3,980 


20 








1,756 


930 





2,637 


1,350 





3,701 


1,900 





4,948 


2,520 





6,376 


3,250 





7,988 


4,060 





9,785 


4,980 





11,753 


6,000 


2 


59 


1,150 


755 


81 


1,694 


1,100 


107 


2,343 


1,520 


139 


3,097 


2,000 


175 


3,955 


2,570 


220 


4,916 


3,200 


269 


5,983 


3,910 


321 


7,154 


4,700 


5 


101 


1,133 


738 


135 


1,674 


1,079 


174 


2,320 


1,498 


219 


3,071 


1,978 


270 


3,926 


2,544 


337 


4,885 


3,174 


403 


5,950 


3,880 


475 


7,119 


4,662 


10 


130 


1,105 


710 


172 


1,641 


1,045 


220 


2,282 


1,460 


273 


3,029 


1,940 


334 


3,880 


2,500 


413 


4,835 


3,130 


489 


5,896 


3,830 


573 


7,063 


4,600 


15 


150 


1,078 


688 


195 


1,609 


1,018 


248 


2,245 


1,425 


306 


2,988 


1,910 


372 


3,835 


2,465 


459 


4,786 


3,090 


541 


5,844 


3,795 


631 


7,007 


4,575 


20 


167 


1,052 


665 


217 


1,578 


990 


273 


2,210 


1,390 


335 


2,948 


1,880 


404 


3,791 


2,430 


495 


4,737 


3,050 


585 


5,792 


3,760 


689 


6,953 


4,550 



(continued) 



<£> 



TABLE 504.2(1) — conliinuedl 
TYPE B DOUBLE-WALL GAS VEMT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



■HI 



HEIGHT 

(H) 

(feet) 


LATERAL 

(L) 

(feet) 


VENT DlAiWETER— <D) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


iViin 


n/iax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








1,977 


1,060 





3,004 


1,550 





4,252 


2,170 





5,725 


2,920 





7,420 


3,770 





9,341 


4,750 





11,483 


5,850 





13,848 


7,060 


2 


54 


1,351 


865 


74 


2,004 


1,310 


98 


2,786 


1,800 


127 


3,696 


2,380 


159 


4,734 


3,050 


199 


5,900 


3,810 


241 


7,194 


4,650 


285 


8,617 


5,600 


5 


96 


1,332 


851 


127 


1,981 


1,289 


164 


2,759 


1,775 


206 


3,666 


2,350 


252 


4,701 


3,020 


312 


5,863 


3,783 


373 


7,155 


4,622 


439 


8,574 


5,552 


10 


125 


1,301 


829 


164 


1,944 


1,254 


209 


2,716 


1,733 


259 


3,617 


2,300 


316 


4,647 


2,970 


386 


5,803 


3,739 


456 


7,090 


4,574 


535 


8,505 


5,471 


15 


143 


1,272 


807 


187 


1,908 


1,220 


237 


2,674 


1,692 


292 


3,570 


2,250 


354 


4,594 


2,920 


431 


5,744 


3,695 


507 


7,026 


4,527 


590 


8,437 


5,391 


20 


160 


1,243 


784 


207 


1,873 


1,185 


260 


2,633 


1,650 


319 


3,523 


2,200 


384 


4,542 


2,870 


467 


5,686 


3,650 


548 


6,964 


4,480 


639 


8,370 


5,310 


30 


195 


1,189 


745 


246 


1,807 


1,130 


305 


2,555 


1,585 


369 


3,433 


2,130 


440 


4,442 


2,785 


540 


5,574 


3,565 


635 


6,842 


4,375 


739 


8,239 


5,225 


50 








2,231 


1,195 





3,441 


1,825 





4,934 


2,550 





6,711 


3,440 





8,774 


4,460 





11,129 


5,635 





13,767 


6,940 





16,694 


8,430 


2 


41 


1,620 


1,010 


66 


2,431 


1,513 


86 


3,409 


2,125 


113 


4,554 


2,840 


141 


5,864 


3,670 


171 


7,339 


4,630 


209 


8,980 


5,695 


251 


10,788 


6,860 


5 


90 


1,600 


996 


118 


2,406 


1,495 


151 


3,380 


2,102 


191 


4,520 


2,813 


234 


5,826 


3,639 


283 


7,295 


4,597 


336 


8,933 


5,654 


394 


10,737 


6,818 


10 


118 


1,567 


972 


154 


2,366 


1,466 


196 


3,332 


2,064 


243 


4,464 


2,767 


295 


5,763 


3,585 


355 


7,224 


4,542 


419 


8,855 


5,585 


491 


10,652 


6,749 


15 


136 


1,536 


948 


177 


2,327 


1,437 


222 


3,285 


2,026 


274 


4,409 


2,721 


330 


5,701 


3,534 


396 


7,155 


4,511 


465 


8,779 


5,546 


542 


10,570 


6,710 


20 


151 


1,505 


924 


195 


2,288 


1,408 


244 


3,239 


1,987 


300 


4,356 


2,675 


361 


5,641 


3,481 


433 


7,086 


4,479 


506 


8,704 


5,506 


586 


10,488 


6,670 


30 


183 


1,446 


876 


232 


2,214 


1,349 


287 


3,150 


1,910 


347 


4,253 


2,631 


412 


5,523 


3,431 


494 


6,953 


4,421 


577 


8,557 


5,444 


672 


10,328 


6,603 


100 








2,491 


1,310 





3,925 


2,050 





5,729 


2,950 





7,914 


4,050 





10,485 


5,300 





13,454 


6,700 





16,817 


8,600 





20,578 


10,300 


2 


30 


1,975 


1,170 


44 


3,027 


1,820 


72 


4,313 


2,550 


95 


5,834 


3,500 


120 


7,591 


4,600 


138 


9,577 


5,800 


169 


11,803 


7,200 


204 


14,264 


8,800 


5 


82 


1,955 


1,159 


107 


3,002 


1,803 


136 


4,282 


2,531 


172 


5,797 


3,475 


208 


7,548 


4,566 


245 


9,528 


5,769 


293 


11,748 


7,162 


341 


14,204 


8,756 


10 


108 


1,923 


1,142 


142 


2,961 


1,775 


180 


4,231 


2,500 


223 


5,737 


3,434 


268 


7,478 


4,509 


318 


9,447 


5,717 


374 


11,658 


7,100 


436 


14,105 


8,683 


15 


126 


1,892 


1,124 


163 


2,920 


1,747 


206 


4,182 


2,469 


252 


5,678 


3,392 


304 


7,409 


4,451 


358 


9,367 


5,665 


418 


11,569 


7,037 


487 


14,007 


8,610 


20 


141 


1,861 


1,107 


181 


2,880 


1,719 


226 


4,133 


2,438 


277 


5,619 


3,351 


330 


7,341 


4,394 


387 


9,289 


5,613 


452 


11,482 


6,975 


523 


13,910 


8,537 


30 


170 


1,802 


1,071 


215 


2,803 


1,663 


265 


4,037 


2,375 


319 


5,505 


3,267 


378 


7,209 


4,279 


446 


9,136 


5,509 


514 


11,310 


6,850 


592 


13,720 


8,391 


50 


241 


1,688 


1,000 


292 


2,657 


1,550 


350 


3,856 


2,250 


415 


5,289 


3,100 


486 


6,956 


4,050 


572 


8,841 


5,300 


659 


10,979 


6,600 


752 


13,354 


8,100 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



O 



(J) 



TABLE 504.2(2) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



m 

< 



c 
m 

r" 

O 
> 

O 

o 

Q 

m 
O 

Tl 

m 

< 
o 

H 
> 



HEIGHT 
(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAMETER— (D) inches 


3456789 10 12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


iUlax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 





38 


77 


45 


59 


151 


85 


85 


249 


140 


126 


373 


204 


165 


522 


284 


211 


695 


369 


267 


894 


469 


371 


1,118 


569 


537 


1,639 


849 


2 


39 


51 


36 


60 


96 


66 


85 


156 


104 


123 


231 


156 


159 


320 


213 


201 


423 


284 


251 


541 


368 


347 


673 


453 


498 


979 


648 


4 


NA 


NA 


33 


74 


92 


63 


102 


152 


102 


146 


225 


152 


187 


313 


208 


237 


416 


277 


295 


533 


360 


409 


664 


443 


584 


971 


638 


6 


NA 


NA 


31 


83 


89 


60 


114 


147 


99 


163 


220 


148 


207 


307 


203 


263 


409 


271 


327 


526 


352 


449 


656 


433 


638 


962 


627 


8 





37 


83 


50 


58 


164 


93 


83 


273 


154 


123 


412 


234 


161 


580 


319 


206 


777 


414 


258 


1,002 


536 


360 


1,257 


658 


521 


1,852 


967 


2 


39 


56 


39 


59 


108 


75 


83 


176 


119 


121 


261 


179 


155 


363 


246 


197 


482 


321 


246 


617 


417 


339 


768 


513 


486 


1,120 


743 


5 


NA 


NA 


37 


77 


102 


69 


107 


168 


114 


151 


252 


171 


193 


352 


235 


245 


470 


311 


305 


604 


404 


418 


754 


500 


598 


1,104 


730 


8 


NA 


NA 


33 


90 


95 


64 


122 


161 


107 


175 


243 


163 


223 


342 


225 


280 


458 


300 


344 


591 


392 


470 


740 


486 


665 


1,089 


715 


10 





37 


87 


53 


57 


174 


99 


82 


293 


165 


120 


444 


254 


158 


628 


344 


202 


844 


449 


253 


1,093 


584 


351 


1,373 


718 


507 


2,031 


1,057 


2 


39 


61 


41 


59 


117 


80 


82 


193 


128 


119 


287 


194 


153 


400 


272 


193 


531 


354 


242 


681 


456 


332 


849 


559 


475 


1,242 


848 


5 


52 


56 


39 


76 


111 


76 


105 


185 


122 


148 


277 


186 


190 


388 


261 


241 


518 


344 


299 


667 


443 


409 


834 


544 


584 


1,224 


825 


10 


NA 


NA 


34 


97 


100 


68 


132 


171 


112 


188 


261 


171 


237 


369 


241 


296 


497 


325 


363 


643 


423 


492 


808 


520 


688 


1,194 


788 


15 





36 


93 


57 


56 


190 


111 


80 


325 


186 


116 


499 


283 


153 


713 


388 


195 


966 


523 


244 


1,259 


681 


336 


1,591 


838 


488 


2,374 


1,237 


2 


38 


69 


47 


57 


136 


93 


80 


225 


149 


115 


337 


224 


148 


473 


314 


187 


631 


413 


232 


812 


543 


319 


1,015 


673 


457 


1,491 


983 


5 


51 


63 


44 


75 


128 


86 


102 


216 


140 


144 


326 


217 


182 


459 


298 


231 


616 


400 


287 


795 


526 


392 


997 


657 


562 


1,469 


963 


10 


NA 


NA 


39 


95 


116 


79 


128 


201 


131 


182 


308 


203 


228 


438 


284 


284 


592 


381 


349 


768 


501 


470 


966 


628 


664 


1,433 


928 


15 


NA 


NA 


NA 


NA 


NA 


72 


158 


186 


124 


220 


290 


192 


272 


418 


269 


334 


568 


367 


404 


742 


484 


540 


937 


601 


750 


1,399 


894 


20 





35 


96 


60 


54 


200 


118 


78 


346 


201 


114 


537 


306 


149 


772 


428 


190 


1,053 


573 


238 


1,379 


750 


326 


1,751 


927 


473 


2,631 


1,346 


2 


37 


74 


50 


56 


148 


99 


78 


248 


165 


113 


375 


248 


144 


528 


344 


182 


708 


468 


227 


914 


611 


309 


1,146 


754 


443 


1,689 


1,098 


5 


50 


68 


47 


73 


140 


94 


100 


239 


158 


141 


363 


239 


178 


514 


334 


224 


692 


457 


279 


896 


596 


381 


1,126 


734 


547 


1,665 


1,074 


10 


NA 


NA 


41 


93 


129 


86 


125 


223 


146 


177 


344 


224 


222 


491 


316 


277 


666 


437 


339 


866 


570 


457 


1,092 


702 


646 


1,626 


1,037 


15 


NA 


NA 


NA 


NA 


NA 


80 


155 


208 


136 


216 


325 


210 


264 


469 


301 


325 


640 


419 


393 


838 


549 


526 


1,060 


677 


730 


1,587 


1,005 


20 


NA 


NA 


NA 


NA 


NA 


NA 


186 


192 


126 


254 


306 


196 


309 


448 


285 


374 


616 


400 


448 


810 


526 


592 


1,028 


651 


808 


1,550 


973 



(continued) 



TABLE 504.2(2)— conHinued 
E B DOUBLE-WALL GAS VEiSJT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(H) 

(feet) 


1 

LATERAL 
(feet) 


VEiMT DIARflETER— (D) inches 


3 


4 




5 






6 






7 






8 






9 






10 


12 


APPLIAIMCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


iViax 


Min 


IVlax 


iVJax 


iVlin 


iMax 


IViax 


iVJin 


Max 


iViax 


iViin 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 





34 


99 


63 


53 


211 


127 


76 


372 


219 


110 


584 


334 


144 


849 


472 


184 


1,168 


647 


229 


1,542 


852 


312 


1,971 


1,056 


454 


2,996 


1,545 


2 


37 


80 


56 


55 


164 


HI 


76 


281 


183 


109 


429 


279 


139 


610 


392 


175 


823 


533 


219 


1,069 


698 


296 


1,346 


863 


424 


1,999 


1,308 


5 


49 


74 


52 


72 


157 


106 


98 


271 


173 


136 


417 


271 


171 


595 


382 


215 


806 


521 


269 


1,049 


684 


366 


1,324 


846 


524 


1,971 


1,283 


10 


NA 


NA 


NA 


91 


144 


98 


122 


255 


168 


171 


397 


257 


213 


570 


367 


265 


777 


501 


327 


1,017 


662 


440 


1,287 


821 


620 


1,927 


1,234 


15 


NA 


NA 


NA 


115 


131 


NA 


151 


239 


157 


208 


377 


242 


255 


547 


349 


312 


750 


481 


379 


985 


638 


507 


1,251 


794 


702 


1,884 


1,205 


20 


NA 


NA 


NA 


NA 


NA 


NA 


181 


223 


NA 


246 


357 


228 


298 


524 


333 


360 


723 


461 


433 


955 


615 


570 


1,216 


768 


780 


1,841 


1,166 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


389 


477 


305 


461 


670 


426 


541 


895 


574 


704 


1,147 


720 


937 


1,759 


1,101 


50 





33 


99 


66 


51 


213 


133 


73 


394 


230 


105 


629 


361 


138 


928 


515 


176 


1,292 


704 


220 


1,724 


948 


295 


2,223 


1,189 


428 


3,432 


1,818 


2 


36 


84 


61 


53 


181 


121 


73 


318 


205 


104 


495 


312 


133 


712 


443 


168 


971 


613 


209 


1,273 


811 


280 


1,615 


1,007 


401 


2,426 


1,509 


5 


48 


80 


NA 


70 


174 


117 


94 


308 


198 


131 


482 


305 


164 


696 


435 


204 


953 


602 


257 


1,252 


795 


347 


1,591 


991 


496 


2,396 


1,490 


10 


NA 


NA 


NA 


89 


160 


NA 


118 


292 


186 


162 


461 


292 


203 


671 


420 


253 


923 


583 


313 


1,217 


765 


418 


1,551 


963 


589 


2,347 


1,455 


15 


NA 


NA 


NA 


112 


148 


NA 


145 


275 


174 


199 


441 


280 


244 


646 


405 


299 


894 


562 


363 


1,183 


736 


481 


1,512 


934 


668 


2,299 


1,421 


20 


NA 


NA 


NA 


NA 


NA 


NA 


176 


257 


NA 


236 


420 


267 


285 


622 


389 


345 


866 


543 


415 


1,150 


708 


544 


1,473 


906 


741 


2,251 


1,387 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


315 


376 


NA 


373 


573 


NA 


442 


809 


502 


521 


1,086 


649 


674 


1,399 


848 


892 


2,159 


1,318 


100 





NA 


NA 


NA 


49 


214 


NA 


69 


403 


NA 


100 


659 


395 


131 


991 


555 


166 


1,404 


765 


207 


1,900 


1,033 


273 


2,479 


1,300 


395 


3,912 


2,042 


2 


NA 


NA 


NA 


51 


192 


NA 


70 


351 


NA 


98 


563 


373 


125 


828 


508 


158 


1,152 


698 


196 


1,532 


933 


259 


1,970 


1,168 


371 


3,021 


1,817 


5 


NA 


NA 


NA 


67 


186 


NA 


90 


342 


NA 


125 


551 


366 


156 


813 


501 


194 


1,134 


688 


240 


1,511 


921 


322 


1,945 


1,153 


460 


2,990 


1,796 


10 


NA 


NA 


NA 


85 


175 


NA 


113 


324 


NA 


153 


532 


354 


191 


789 


486 


238 


1,104 


672 


293 


1,477 


902 


389 


1,905 


1,133 


547 


2,938 


1,763 


15 


NA 


NA 


NA 


132 


162 


NA 


138 


310 


NA 


188 


511 


343 


230 


764 


473 


281 


1,075 


656 


342 


1,443 


884 


447 


1.865 


1,110 


618 


2,888 


1,730 


20 


NA 


NA 


NA 


NA 


NA 


NA 


168 


295 


NA 


224 


487 


NA 


270 


739 


458 


325 


1,046 


639 


391 


1,410 


864 


507 


1,825 


1,087 


690 


2,838 


1,696 


30 


NA 


NA 


NA 


NA 


NA 


NA 


231 


264 


NA 


301 


448 


NA 


355 


685 


NA 


418 


988 


NA 


491 


1,343 


824 


631 


1,747 


1,041 


834 


2,739 


1,627 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


540 


584 


NA 


617 


866 


NA 


711 


1,205 


NA 


895 


1,591 


NA 


1,138 


2,547 


L489 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



O 



m 



TABLE 504.2(3) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



c 
m 

r- 

O 
> 
(/) 

O 

o 
o 
m 

O 



HEIGHT 

(«) 
(feet) 


LATERAL 
(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


iVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


320 


NA 


NA 


401 


NA 


NA 


581 


5 


NA 


NA 


25 


NA 


NA 


49 


NA 


NA 


82 


NA 


NA 


117 


NA 


NA 


165 


NA 


NA 


231 


NA 


NA 


298 


NA 


NA 


376 


NA 


NA 


561 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


198 


NA 


NA 


266 


84 


590 


350 


100 


728 


446 


139 


1,024 


651 


5 


NA 


NA 


26 


NA 


NA 


52 


NA 


NA 


88 


NA 


NA 


134 


NA 


NA 


183 


NA 


NA 


247 


NA 


NA 


328 


149 


711 


423 


201 


1,007 


640 


8 


NA 


NA 


24 


NA 


NA 


48 


NA 


NA 


83 


NA 


NA 


127 


NA 


NA 


175 


NA 


NA 


239 


NA 


NA 


318 


173 


695 


410 


231 


990 


623 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


103 


NA 


NA 


162 


NA 


NA 


221 


68 


519 


298 


82 


655 


388 


98 


810 


491 


136 


1,144 


724 


5 


NA 


NA 


28 


NA 


NA 


57 


NA 


NA 


96 


NA 


NA 


148 


NA 


NA 


204 


NA 


NA 


277 


124 


638 


365 


146 


791 


466 


196 


1,124 


712 


10 


NA 


NA 


25 


NA 


NA 


50 


NA 


NA 


87 


NA 


NA 


139 


NA 


NA 


191 


NA 


NA 


263 


155 


610 


347 


182 


762 


444 


240 


1,093 


668 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


114 


NA 


NA 


179 


53 


475 


250 


64 


613 


336 


77 


779 


441 


92 


968 


562 


127 


1,376 


841 


5 


NA 


NA 


35 


NA 


NA 


62 


NA 


NA 


107 


NA 


NA 


164 


NA 


NA 


231 


99 


594 


313 


118 


759 


416 


139 


946 


533 


186 


1,352 


828 


10 


NA 


NA 


28 


NA 


NA 


55 


NA 


NA 


97 


NA 


NA 


153 


NA 


NA 


216 


126 


565 


296 


148 


727 


394 


173 


912 


567 


229 


1,315 


777 


15 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


89 


NA 


NA 


141 


NA 


NA 


201 


NA 


NA 


281 


171 


698 


375 


198 


880 


485 


259 


1,280 


742 


20 


2 


NA 


NA 


38 


NA 


NA 


74 


NA 


NA 


124 


NA 


NA 


201 


51 


522 


274 


61 


678 


375 


73 


867 


491 


87 


1,083 


627 


121 


1,548 


953 


5 


NA 


NA 


36 


NA 


NA 


68 


NA 


NA 


116 


NA 


NA 


184 


80 


503 


254 


95 


658 


350 


113 


845 


463 


133 


1,059 


597 


179 


1,523 


933 


10 


NA 


NA 


NA 


NA 


NA 


60 


NA 


NA 


107 


NA 


NA 


172 


NA 


NA 


237 


122 


627 


332 


143 


811 


440 


167 


1,022 


566 


221 


1,482 


879 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


97 


NA 


NA 


159 


NA 


NA 


220 


NA 


NA 


314 


165 


780 


418 


191 


987 


541 


251 


1,443 


840 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


83 


NA 


NA 


148 


NA 


NA 


206 


NA 


NA 


296 


186 


750 


397 


214 


955 


513 


277 


1,406 


807 



(continued) 



TABLE 504.2(3) — continued 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



HEIGHT 

(W) 

(feet) 


LATERAL 

(L) 

(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAiWETER— (O) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


iVIax 


IVIin 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


82 


NA 


NA 


137 


NA 


NA 


216 


47 


581 


303 


57 


762 


421 


68 


985 


558 


81 


1,240 


717 


111 


1,793 


1,112 


5 


NA 


NA 


NA 


NA 


NA 


76 


NA 


NA 


128 


NA 


NA 


198 


75 


561 


281 


90 


741 


393 


106 


962 


526 


125 


1,216 


683 


169 


1,766 


1,094 


10 


NA 


NA 


NA 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


184 


NA 


NA 


263 


115 


709 


373 


135 


927 


500 


158 


1,176 


648 


210 


1,721 


1,025 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


107 


NA 


NA 


171 


NA 


NA 


243 


NA 


NA 


353 


156 


893 


476 


181 


1,139 


621 


239 


1,679 


981 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


159 


NA 


NA 


227 


NA 


NA 


332 


176 


860 


450 


203 


1,103 


592 


264 


1,638 


940 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


188 


NA 


NA 


288 


NA 


NA 


416 


249 


1,035 


555 


318 


1,560 


877 


50 


2 


NA 


NA 


NA 


NA 


NA 


92 


NA 


NA 


161 


NA 


NA 


251 


NA 


NA 


351 


51 


840 


477 


61 


1,106 


633 


72 


1,413 


812 


99 


2,080 


1,243 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


151 


NA 


NA 


230 


NA 


NA 


323 


83 


819 


445 


98 


1,083 


596 


116 


1,387 


774 


155 


2,052 


1,225 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


138 


NA 


NA 


215 


NA 


NA 


304 


NA 


NA 


424 


126 


1,047 


567 


147 


1,347 


733 


195 


2,006 


1,147 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


127 


NA 


NA 


199 


NA 


NA 


282 


NA 


NA 


400 


146 


1,010 


539 


170 


1,307 


702 


222 


1,961 


1,099 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


185 


NA 


NA 


264 


NA 


NA 


376 


165 


977 


511 


190 


1,269 


669 


246 


1,916 


1,050 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


327 


NA 


NA 


468 


233 


1,196 


623 


295 


1,832 


984 


Minimum internal 
area of chimney 
(square inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum internal 
area of chimney 
(square inches) 


49 


88 


137 


198 


269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



TABLE 504.2(4) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



o 

3 



Q 

> 

m 
o 
O 
o 
m 

O 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAMETER— (O) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


IVlax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


319 


NA 


NA 


400 


NA 


NA 


580 


5 


NA 


NA 


25 


NA 


NA 


48 


NA 


NA 


81 


NA 


NA 


116 


NA 


NA 


164 


NA 


NA 


230 


NA 


NA 


297 


NA 


NA 


375 


NA 


NA 


560 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


197 


NA 


NA 


265 


NA 


NA 


349 


382 


725 


445 


549 


1,021 


650 


5 


NA 


NA 


26 


NA 


NA 


51 


NA 


NA 


87 


NA 


NA 


133 


NA 


NA 


182 


NA 


NA 


246 


NA 


NA 


327 


NA 


NA 


422 


673 


1,003 


638 


8 


NA 


NA 


23 


NA 


NA 


47 


NA 


NA 


82 


NA 


NA 


126 


NA 


NA 


174 


NA 


NA 


237 


NA 


NA 


317 


NA 


NA 


408 


747 


985 


621 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


102 


NA 


NA 


161 


NA 


NA 


220 


216 


518 


297 


271 


654 


387 


373 


808 


490 


536 


1,142 


722 


5 


NA 


NA 


28 


NA 


NA 


56 


NA 


NA 


95 


NA 


NA 


147 


NA 


NA 


203 


NA 


NA 


276 


334 


635 


364 


459 


789 


465 


657 


1,121 


710 


10 


NA 


NA 


24 


NA 


NA 


49 


NA 


NA 


86 


NA 


NA 


137 


NA 


NA 


189 


NA 


NA 


261 


NA 


NA 


345 


547 


758 


441 


771 


1,088 


665 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


113 


NA 


NA 


178 


166 


473 


249 


211 


611 


335 


264 


776 


440 


362 


965 


560 


520 


1,373 


840 


5 


NA 


NA 


32 


NA 


NA 


61 


NA 


NA 


106 


NA 


NA 


163 


NA 


NA 


230 


261 


591 


312 


325 


775 


414 


444 


942 


531 


637 


1,348 


825 


10 


NA 


NA 


27 


NA 


NA 


54 


NA 


NA 


96 


NA 


NA 


151 


NA 


NA 


214 


NA 


NA 


294 


392 


722 


392 


531 


907 


504 


749 


1,309 


774 


15 


NA 


NA 


NA 


NA 


NA 


46 


NA 


NA 


87 


NA 


NA 


138 


NA 


NA 


198 


NA 


NA 


278 


452 


692 


372 


606 


873 


481 


841 


1,272 


738 


20 


2 


NA 


NA 


38 


NA 


NA 


73 


NA 


NA 


123 


NA 


NA 


200 


163 


520 


273 


206 


675 


374 


258 


864 


490 


252 


1,079 


625 


508 


1,544 


950 


5 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


183 


80 


NA 


252 


255 


655 


348 


317 


842 


461 


433 


1,055 


594 


623 


1,518 


930 


10 


NA 


NA 


NA 


NA 


NA 


59 


NA 


NA 


105 


NA 


NA 


170 


NA 


NA 


235 


312 


622 


330 


382 


806 


437 


517 


1,016 


562 


733 


1,475 


875 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


95 


NA 


NA 


156 


NA 


NA 


217 


NA 


NA 


311 


442 


773 


414 


591 


979 


539 


823 


1,434 


835 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


80 


NA 


NA 


144 


NA 


NA 


202 


NA 


NA 


292 


NA 


NA 


392 


663 


944 


510 


911 


1,394 


800 



(continued) 



o 

O 
O 

m 
O 

z 
m 

Q 



504.2(4) — conSinyed 
SONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(W) 

(feet) 


LATERAL 

m 

(feet) 


TYPE B DOUBLE-WALL CONiMECTOR DlAiWETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIAIMCE mPUJ RATrfMG IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


IViin 


IVlax 


iVIax 


IViin 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


81 


NA 


NA 


136 


NA 


NA 


215 


158 


578 


302 


200 


759 


420 


249 


982 


556 


340 


1,237 


715 


489 


1,789 


1,110 


5 


NA 


NA 


NA 


NA 


NA 


75 


NA 


NA 


127 


NA 


NA 


196 


NA 


NA 


279 


245 


737 


391 


306 


958 


524 


417 


1,210 


680 


600 


1,760 


1,090 


10 


NA 


NA 


NA 


NA 


NA 


66 


NA 


NA 


113 


NA 


NA 


182 


NA 


NA 


260 


300 


703 


370 


370 


920 


496 


500 


1,168 


644 


708 


1,713 


1,020 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


105 


NA 


NA 


168 


NA 


NA 


240 


NA 


NA 


349 


428 


884 


471 


572 


1,128 


615 


798 


1,668 


975 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


88 


NA 


NA 


155 


NA 


NA 


223 


NA 


NA 


327 


NA 


NA 


445 


643 


1,089 


585 


883 


1,624 


932 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


182 


NA 


NA 


281 


NA 


NA 


408 


NA 


NA 


544 


1,055 


1,539 


865 


50 


2 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


160 


NA 


NA 


250 


NA 


NA 


350 


191 


837 


475 


238 


1,103 


631 


323 


1,408 


810 


463 


2,076 


1,240 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


149 


NA 


NA 


228 


NA 


NA 


321 


NA 


NA 


442 


293 


1,078 


593 


398 


1,381 


770 


571 


2,044 


1,220 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


136 


NA 


NA 


212 


NA 


NA 


301 


NA 


NA 


420 


355 


1,038 


562 


447 


1,337 


728 


674 


1,994 


1,140 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


124 


NA 


NA 


195 


NA 


NA 


278 


NA 


NA 


395 


NA 


NA 


533 


546 


1,294 


695 


761 


1,945 


1,090 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


180 


NA 


NA 


258 


NA 


NA 


370 


NA 


NA 


504 


616 


1,251 


660 


844 


1,898 


1,040 


30 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


318 


NA 


NA 


458 


NA 


NA 


610 


1,009 


1,805 


970 


Minimum 

internal area of 

chimney (square 

inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum 

internal area of 

chimney (square 

inches) 


49 


88 


137 


198 


269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



m 

< 

> 

o 

< 
m 

H 



CHIMNEYS AND VENTS 



TABLE 504.2(5) 

SINGLE-WALL METAL PIPE OR TYPE B 

ASBESTOS CEMENT VENT 



Number of Appliances 



Appliance Type 



Appliance Vent Connection 



Single 



Draft hood equipped 



Connected directly to pipe or vent 



HEIGHT 

(H) 
(feet) 


LATERAL 

{L) 

(feet) 


VENT DIAWiETER— (D) inches 


3 


4 


5 


6 


7 


8 


10 


12 


iWAXIWiUlVl APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6 





39 


70 


116 


170 


232 


312 


500 


750 


2 


31 


55 


94 


141 


194 


260 


415 


620 


5 


28 


51 


88 


128 


177 


242 


390 


600 


8 





42 


76 


126 


185 


252 


340 


542 


815 


2 


32 


61 


102 


154 


210 


284 


451 


680 


5 


29 


56 


95 


141 


194 


264 


430 


648 


10 


24 


49 


86 


131 


180 


250 


406 


625 


10 





45 


84 


138 


202 


279 


372 


606 


912 


2 


35 


67 


111 


168 


233 


311 


505 


760 


5 


32 


61 


104 


153 


215 


289 


480 


724 


10 


27 


54 


94 


143 


200 


274 


455 


700 


15 


NA 


46 


84 


130 


186 


258 


432 


666 


15 





49 


91 


151 


223 


312 


420 


684 


1,040 


2 


39 


72 


122 


186 


260 


350 


570 


865 


5 


35 


67 


110 


170 


240 


325 


540 


825 


10 


30 


58 


103 


158 


223 


308 


514 


795 


15 


NA 


50 


93 


144 


207 


291 


488 


760 


20 


NA 


NA 


82 


132 


195 


273 


466 


726 


20 





53 


101 


163 


252 


342 


470 


770 


1,190 


2 


42 


80 


136 


210 


286 


392 


641 


990 


5 


38 


74 


123 


192 


264 


364 


610 


945 


10 


32 


65 


115 


178 


246 


345 


571 


910 


15 


NA 


55 


104 


163 


228 


326 


550 


870 


20 


NA 


NA 


91 


149 


214 


306 


525 


832 


30 





56 


108 


183 


276 


384 


529 


878 


1,370 


2 


44 


84 


148 


230 


320 


441 


730 


1,140 


5 


NA 


78 


137 


210 


296 


410 


694 


1,080 


10 


NA 


68 


125 


196 


274 


388 


656 


1,050 


15 


NA 


NA 


113 


177 


258 


366 


625 


1,000 


20 


NA 


NA 


99 


163 


240 


344 


596 


960 


30 


NA 


NA 


NA 


NA 


192 


295 


540 


890 


50 





NA 


120 


210 


310 


443 


590 


980 


1,550 


2 


NA 


95 


171 


260 


370 


492 


820 


1,290 


5 


NA 


NA 


159 


234 


342 


474 


780 


1,230 


10 


NA 


NA 


146 


221 


318 


456 


730 


1,190 


15 


NA 


NA 


NA 


200 


292 


407 


705 


1,130 


20 


NA 


NA 


NA 


185 


276 


384 


670 


1,080 


30 


NA 


NA 


NA 


NA 


222 


330 


605 


1,010 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



90 



FUEL GAS CODE OF NEW YORK STATE 



S AMD VENTS 



S04.2o7 Limer system sizmg. Listed corrugated metallic 
chimney liner systems in masonry chimneys shall be sized 
by using Table 504.2(1) or 504.2(2) for Type B vents with 
the maximum capacity reduced by 20 percent (0.80 x maxi- 
mum capacity) and the minimum capacity as shown in Table 
504.2(1) or 504.2(2). Corrugated metallic liner systems in- 
stalled with bends or offsets shall have their maximum ca- 
pacity further reduced in accordance with Section 504.2.3. 
The 20-percent reduction for corrugated metallic chimney 
liner systems includes an allowance for one long-radius 
90-degree (157 rad) turn at the bottom of the liner. 

504.2.8 VeiLt area aed dnameltero Where the vertical vent 
has a larger diameter than the vent connector, the vertical 
vent diameter shall be used to determine the minimum vent 
capacity, and the connector diameter shall be used to deter- 
mine the maximum vent capacity. The flow area of the verti- 
cal vent shall not exceed seven times the flow area of the 
listed appliance categorized vent area, flue collar area or 
draft hood outlet area unless designed in accordance with 
approved engineering methods. 



imnney amd vemlt locatnooSo Tables 504.2(1), 
504.2(2), 504.2(3), 504.2(4) and 504.2(5) shall be used for 
chimneys and vents not exposed to the outdoors below the 
roof line. A Type B vent or listed chimney lining system 
passing through an unused masonry chimney flue shall not 
be considered to be exposed to the outdoors. Table 504.2(3) 
in combination with Table 504.3(6) shall be used for 
clay-tile-lined exterior masonry chimneys, provided all of 
the following are met: 

1 . Vent connector is Type B double-wall. 

2. Vent connector length is limited to 1 V2 feet for each 
inch (18 mm per mm) of vent connector diameter. 

3. The appliance is draft hood equipped. 

4. The input rating is less than the maximum capacity 
given by Table 504.2(3). 

5. For a water heater, the outdoor design temperature is 
not less than 5°F(-15°C). 

6. For a space-heating appliance, the input rating is 
greater than the minimum capacity given by Table 
504.3(6). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 



ni: The installation of vents serving hsted appli- 
ances shall be permitted to be in accordance with the ap- 
pliance manufacturer's instructions and the terms of the 
listing. 

504.2.1® Corruigated vemU; connector size. Corrugated 
vent connectors shall be not smaller than the listed appliance 
categorized vent diameter, flue collar diameter or draft hood 
outlet diameter. 

504.2.11 Venlt coramector sue Imitaitmn, Vent connectors 
shall not be increased in size more than two sizes greater 
than the listed appliance categorized vent diameter, flue col- 
lar diameter or draft hood outlet diameter. 



504.2.12 Component commnmglmg. In a single run of vent 
or vent connector, different diameters and types of vent and 
connector components shall be permitted to be used, pro- 
vided that all such sizes and types are permitted by the ta- 
bles. 

504.2.13 Table SmterpoIaltBon. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between the table entries (see Example 3, Appendix B). 



L Extrapolation beyond 
the table entries shall not be permitted. 



504.2.15 Engineernng calcraEations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent 
capacities. 

504.3 Application of multiple appliance vent Tables 
504.3(1) thromgh 504.3(8). The application of Tables 504.3(1) 
through 504.3(8) shall be subject to the requirements of Sec- 
tions 504.3.1 through 504.3.26. 

504.3.1 Vent obstructions. These venting tables shall not 
be used where obstructions, as described in Section 503.15, 
are installed in the venting system. The installation of vents 
serving listed appliances with vent dampers shall be in ac- 
cordance with the appliance manufacturer's instructions or 
in accordance with the following: 

1 . The maximum capacity of the vent connector shall be 
determined using the NAT Max column. 

2. The maximum capacity of the vertical vent or chim- 
ney shall be determined using the FAN + NAT column 
when the second appliance is a fan-assisted appliance, 
or the NAT -1- NAT column when the second appliance 
is equipped with a draft hood. 

3. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance. 

3.1. The minimum capacity of the vent connector 
shall be determined using the FAN Min col- 
umn. 

3.2. The FAN -1- FAN column shall be used where 
the second appliance is a fan-assisted appli- 
ance, and the FAN + NAT column shall be 
used where the second appliance is equipped 
with a draft hood, to determine whether the 
vertical vent or chimney configuration is not 
permitted (NA). Where the vent configuration 
is NA, the vent configuration shall not be per- 
mitted and an alternative venting configura- 
tion shall be utiUzed. 



L The vent connector shall 
be routed to the vent utilizing the shortest possible route. 
Except as provided in Section 504.3.3, the maximum vent 
connector horizontal length shall be 1 '/2 feet for each inch 
(457 mm per mm) of connector diameter as shown in Table 
504.3.2. 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 



TABLE 504.3.2 
MAXIMUM VENT CONNECTOR LENGTH 



CONNECTOR DIAMETER 
MAXIMUM (inches) 


CONNECTOR HORIZONTAL 
LENGTH (feet) 


3 


4'/, 


4 


6 


5 


7V, 


6 


9 


7 


10'/2 


8 


12 


9 


13V, 


10 


15 


12 


18 


14 


21 


16 


24 


18 


27 


20 


30 


22 


33 


24 


36 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

504.3.3 Connectors with longer lengths. Connectors with 
longer horizontal lengths than those listed in Section 
504.3.2 are permitted under the following conditions: 

1 . The maximum capacity (FAN Max or NAT Max) of 
the vent connector shall be reduced 10 percent for 
each additional multiple of the length listed above. 
For example, the maximum length listed above for a 
4-inch (102 mm) connector is 6 feet (1829 mm). With 
a connector length greater than 6 feet (1829 mm) but 
not exceeding 12 feet (3658 mm), the maximum ca- 
pacity must be reduced by 10 percent (0.90 x maxi- 
mum vent connector capacity). With a connector 
length greater than 12 feet (3658 mm) but not exceed- 
ing 18 feet (5486 mm), the maximum capacity must 
be reduced by 20 percent (0.80 x maximum vent 
capacity). 

2. For a connector serving a fan-assisted appliance, the 
minimum capacity (FAN Min) of the connector shall 
be determined by referring to the corresponding sin- 
gle appliance table. For Type B double-wall connec- 
tors. Table 504.2(1) shall be used. For single-wall 
connectors. Table 504.2(2) shall be used. The height 
(H) and lateral (L) shall be measured according to the 
procedures for a single-appliance vent, as if the other 
apphances were not present. 

504.3.4 Vent connector manifold. Where the vent connec- 
tors are combined prior to entering the vertical portion of the 
common vent to form a common vent manifold, the size of 
the common vent manifold and the common vent shall be 
determined by applying a 10-percent reduction (0.90 x 
maximum common vent capacity) to the common vent ca- 
pacity part of the common vent tables. The length of the 
common vent connector manifold (L,„) shall not exceed 1 72 



feet for each inch (457 mm per mm) of common vent con- 
nector manifold diameter (D) (see Figure B-1 1). 

504.3.5 Common vertical vent offset. Where the common 
vertical vent is offset, the maximum capacity of the common 
vent shall be reduced in accordance with Section 504.3.6. 
The horizontal length of the common vent offset (LJ shall 
not exceed 1 V2 feet for each inch (457 mm per mm) of com- 
mon vent diameter. 

504.3.6 Elbows in vents. For each elbow up to and includ- 
ing 45 degrees (0.79 rad) in the common vent, the maximum 
common vent capacity listed in the venting tables shall be 
reduced by 5 percent. For each elbow greater than 45 de- 
grees (0.79 rad) up to and including 90 degrees (1.57 rad), 
the maximum common vent capacity listed in the venting ta- 
bles shall be reduced by 10 percent. 

504.3.7 Elbows in connectors. The vent connector capaci- 
ties listed in the common vent sizing tables include allow- 
ance for two 90-degree (1.57 rad) elbows. For each 
additional elbow up to and including 45 degrees (0.79 rad), 
the maximum vent connector capacity listed in the venting 
tables shall be reduced by 5 percent. For each elbow greater 
than 45 degrees (0.79 rad) up to and including 90 degrees 
(1.57 rad), the maximum vent connector capacity listed in 
the venting tables shall be reduced by 10 percent. 

504.3.8 Common vent minimum size. The cross-sectional 
area of the common vent shall be equal to or greater than the 
cross-sectional area of the largest connector. 

504.3.9 Common vent flttings. At the point where tee or 
wye fittings connect to a common vent, the opening size of 
the fitting shall be equal to the size of the common vent. 
Such fittings shall not be prohibited from having reduced- 
size openings at the point of connection of appliance vent 
connectors. 

504.3.10 High-altitude installations. Sea-level input rat- 
ings shall be used when determining maximum capacity for 
high-altitude installation. Actual input (derated for altitude) 
shall be used for determining minimum capacity for 
high-altitude installation. 

504.3.11 Connector rise measurement. Connector rise 
(R) for each appliance connector shall be measured from the 
draft hood outlet or flue collar to the centerline where the 
vent gas streams come together. 

504.3.12 Vent height measurement. For multiple units of 
equipment all located on one floor, available total height (H) 
shall be measured from the highest draft hood outlet or flue 
collar up to the level of the outlet of the common vent. 

504.3.13 Multistory height measurement. For multistory 
installations, available total height (H) for each segment of 
the system shall be the vertical distance between the highest 
draft hood outlet or flue collar entering that segment and the 
centerline of the next higher interconnection tee (see Figure 
B-13). 

504.3.14 Multistory lowest portion sizing. The size of the 
lowest connector and of the vertical vent leading to the low- 
est interconnection of a multistory system shall be in accor- 
dance with Table 504.2(1) or 504.2(2) for available total 



92 



FUEL GAS CODE OF NEW YORK STATE 



CHBWiNEYS AND VENTS 



height (H) up to the lowest interconnection (see Figure 
B-14). 

504.3.15 MeltSstory commoe veets. Where used in multi- 
story systems, vertical common vents shall be Type B dou- 
ble wall and shall be installed with a hsted vent cap. 

504.3.16 Meltflstory commom vemt offsets. Offsets in mul- 
tistory common vent systems shall be limited to a single off- 
set in each system, and systems with an offset shall comply 
with all of the following: 

1. The offset angle shall not exceed 45 degrees (0.79 
rad) from vertical. 

2. The horizontal length of the offset shall not exceed 
1 '/2 feet for each inch (457 mm per mm) of common 
vent diameter of the segment in which the offset is 
located. 

3. For the segment of the common vertical vent contain- 
ing the offset, the common vent capacity listed in the 
common venting tables shall be reduced by 20 percent 
(0.80 X maximum common vent capacity). 

4. A multistory common vent shall not be reduced in 
size above the offset. 

504.3.17 Vertical vemt maxflmuim size. Where two or more 
appliances are connected to a vertical vent or chimney, the 
flow area of the largest section of vertical vent or chimney 
shall not exceed seven times the smallest listed appliance 
categorized vent areas, flue collar area or draft hood outlet 
area unless designed in accordance with approved engineer- 
ing methods. 

504.3.18 Meltiple input rate appliamces. For appliances 
with more than one input rate, the minimum vent connector 
capacity (FAN Min) determined from the tables shall be less 
than the lowest appliance input rating, and the maximum 
vent connector capacity (FAN Max or NAT Max) deter- 
mined from the tables shall be greater than the highest appli- 
ance input rating. 

504.3.19 LImer system sizimg. Listed, corrugated metallic 
chimney liner systems in masonry chimneys shall be sized 
by using Table 504.3(1) or 504.3(2) for Type B vents, with 
the maximum capacity reduced by 20 percent (0.80 x maxi- 
mum capacity) and the minimum capacity as shown in Table 
504.3(1) or 504.3(2). Corrugated metallic liner systems in- 
stalled with bends or offsets shall have their maximum ca- 
pacity further reduced in accordance with Sections 504.3.5 
and 504.3.6. The 20-percent reduction for corrugated metal- 
lic chimney liner systems includes an allowance for one 
long-radius 90-degree (1.57 rad) turn at the bottom of the 
liner. 



Tables 504.3(1), 
504.3(2), 504.3(3), 504.3(4), and 504.3(5) shall be used for 
chimneys and vents not exposed to the outdoors below the 
roof line. A Type B vent or listed chimney hning system 
passing through an unused masonry chimney flue shall not 
be considered to be exposed to the outdoors. Tables 
504.3(7) and 504.3(8) shall be used for clay-tile-lined exte- 
rior masonry chimneys, provided all of the following condi- 
tions are met: 

1 . Vent connector is Type B double-wall. 



2. At least one appliance is draft hood equipped. 

3. The combined appliance input rating is less than the 
maximum capacity given by Table 504.3(7a) for NAT 
+ NAT or Table 504.3(8a) for FAN -i- NAT. 

4. The input rating of each space-heating appliance is 
greater than the minimum input rating given by Table 
504.3(7b) for NAT + NAT or Table 504.3(8b) for FAN 

-hNAT 

5. The vent connector sizing is in accordance with Table 
504.3(3). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 

Exceptiom: Vents serving listed appliances installed in 
accordance with the appliance manufacturer's instruc- 
tions and the terms of the listing. 

504.3.21 Connector maximem and minimiim size. Vent 
connectors shall not be increased in size more than two sizes 
greater than the listed appliance categorized vent diameter, 
flue collar diameter, or draft hood outlet diameter. Vent con- 
nectors for draft hood-equipped appliances shall not be 
smaller than the draft hood outlet diameter. Where a vent 
connector size(s) determined from the tables for a fan-as- 
sisted appliance(s) is smaller than the flue collar diameter, 
the use of the smaller size(s) shall be permitted provided | 
that the installation complies with all of the following | 
conditions: 

1. Vent connectors for fan-assisted appliance flue col- 
lars 12 inches (305 mm) in diameter or smaller are not 
reduced by more than one table size [e.g., 12 inches to 
10 inches (305 mm to 254 mm) is a one-size reduc- 
tion] and those larger than 12 inches (305 mm) in di- 
ameter are not reduced more than two table sizes [e.g., 
24 inches to 20 inches (610 mm to 508 mm) is a 
two-size reduction]. 

2. The fan-assisted appliance(s) is common vented with 
a draft-hood-equipped appliances(s). 

3. The vent connector has a smooth interior wall. | 

504.3.22 Component commingling. All combinations of 
pipe sizes, single-wall and double-wall metal pipe shall be 
allowed within any connector run(s) or within the common 
vent, provided all of the appropriate tables permit all of the 
desired sizes and types of pipe, as if they were used for the 
entire length of the subject connector or vent. Where sin- 
gle-wall and Type B double-wall metal pipes are used for 
vent connectors within the same venting system, the com- 
mon vent must be sized using Table 504.3(2) or 504.3(4), as 
appropriate. 



le sizes permitted. Where a table permits 
more than one diameter of pipe to be used for a connector or 
vent, all the permitted sizes shall be permitted to be used. 



iterpolation. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between table entries (see Appendix B, Example 3). 

504,3.25 Extrapolation prohibited. Extrapolation beyond 
the table entries shall not be permitted. 



FUEL GAS CODE OF NEW YORK STATE 



93 



CHIMNEYS AND VENTS 



504.3.26 Engineering calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent 
capacities. 



SECTION 505 

DIRECT-VENT, INTEGRAL VENT, 

MECHANICAL VENT AND 

VENTILATION/EXHAUST HOOD VENTING 

505.1 General. The installation of direct- vent and integral vent 
appliances shall be in accordance with Section 503. Mechani- 
cal venting systems and exhaust hood venting systems shall be 
designed and installed in accordance with Section 503. 

505.1.1 Commercial cooking appliances vented by ex- 
haust hoods. Where commercial cooking appliances are 
vented by means of the Type I or Type II kitchen exhaust 
hood system that serves such appliances, the exhaust system 
shall be fan powered and the appliances shall be interlocked 
with the exhaust hood system to prevent appliance opera- 
tion when the exhaust hood system is not operating. Where 
a solenoid valve is installed in the gas piping as part of an in- 
terlock system, gas piping shall not be installed to bypass 
such valve. Dampers shall not be installed in the exhaust 
system. 

Exceptions An interlock between the cooking appliance 
and the exhaust hood system shall not be required for ap- 
pliances that are of the manually operated type and are 
factory equipped with standing pilot burner ignition sys- 
tems. 



SECTION 506 
FACTORY-BUILT CHS! 



INEYS 



506.1 Building heating appliances. Factory-built chimneys 
for building heating appliances producing flue gases having a 
temperature not greater than 1,000°F (538°C), measured at the 
entrance to the chimney, shall be listed and labeled in accor- 
dance with UL 103 and shall be installed and terminated in ac- 
cordance with the manufacturer's installation instructions. 

506.2 Support. Where factory-built chimneys are supported 
by structural members, such as joists and rafters, such mem- 
bers shall be designed to support the additional load. 

506.3 Medium-heat appliances. Factory-built chimneys for 
medium-heat appliances producing flue gases having a tem- 
perature above 1,000°F (538°C), measured at the entrance to 
the chimney, shall be listed and labeled in accordance with UL 
959 and shall be installed and terminated in accordance with 
the manufacturer's installation instructions. 



94 



FUEL GAS CODE OF NEW YORK STATE 



CHDiViNEYS AND VENTS 



TABLE 504.3(1) 
3 DOUBLE-WALL VEiMT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


CONNECTOR 
RISE 

(fl) 
(feet) 


TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAWiETER— (D) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


MIn 


Max 


Max 


MIn 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


IVlax 


6 


1 


22 


37 


26 


35 


66 


46 


46 


106 


72 


58 


164 


104 


77 


225 


142 


92 


296 


185 


109 


376 


237 


128 


466 


289 


2 


23 


41 


31 


37 


75 


55 


48 


121 


86 


60 


183 


124 


79 


253 


168 


95 


333 


220 


112 


424 


282 


131 


526 


345 


3 


24 


44 


35 


38 


81 


62 


49 


132 


96 


62 


199 


139 


82 


275 


189 


97 


363 


248 


114 


463 


317 


134 


575 


386 


8 


1 


22 


40 


27 


35 


72 


48 


49 


114 


76 


64 


176 


109 


84 


243 


148 


100 


320 


194 


118 


408 


248 


138 


507 


303 


2 


23 


44 


32 


36 


80 


57 


51 


128 


90 


66 


195 


129 


86 


269 


175 


103 


356 


230 


121 


454 


294 


141 


564 


358 


3 


24 


47 


36 


37 


87 


64 


53 


139 


101 


67 


210 


145 


88 


290 


198 


105 


384 


258 


123 


492 


330 


143 


612 


402 


10 


1 


22 


43 


28 


34 


78 


50 


49 


123 


78 


65 


189 


113 


89 


257 


154 


106 


341 


200 


125 


436 


257 


146 


542 


314 


2 


23 


47 


33 


36 


86 


59 


51 


136 


93 


67 


206 


134 


91 


282 


182 


109 


374 


238 


128 


479 


305 


149 


596 


372 


3 


24 


50 


37 


37 


92 


67 


52 


146 


104 


69 


220 


150 


94 


303 


205 


HI 


402 


268 


131 


515 


342 


152 


642 


417 


15 


1 


21 


50 


30 


33 


89 


53 


47 


142 


83 


64 


220 


120 


88 


298 


163 


110 


389 


214 


134 


493 


273 


162 


609 


333 


2 


22 


53 


35 


35 


96 


63 


49 


153 


99 


66 


235 


142 


91 


320 


193 


112 


419 


253 


137 


532 


323 


165 


658 


394 


3 


24 


55 


40 


36 


102 


71 


51 


163 


111 


68 


248 


160 


93 


339 


218 


115 


445 


286 


140 


565 


365 


167 


700 


444 


20 


1 


21 


54 


31 


33 


99 


56 


46 


157 


87 


62 


246 


125 


86 


334 


171 


107 


436 


224 


131 


552 


285 


158 


681 


347 


2 


22 


57 


37 


34 


105 


66 


48 


167 


104 


64 


259 


149 


89 


354 


202 


110 


463 


265 


134 


587 


339 


161 


725 


414 


3 


23 


60 


42 


35 


110 


74 


50 


176 


116 


66 


271 


168 


91 


371 


228 


113 


486 


300 


137 


618 


383 


164 


764 


466 


30 


1 


20 


62 


33 


31 


113 


59 


45 


181 


93 


60 


288 


134 


83 


391 


182 


103 


512 


238 


125 


649 


305 


151 


802 


372 


2 


21 


64 


39 


33 


118 


70 


47 


190 


110 


62 


299 


158 


85 


408 


215 


105 


535 


282 


129 


679 


360 


155 


840 


439 


3 


22 


66 


44 


34 


123 


79 


48 


198 


124 


64 


309 


178 


88 


423 


242 


108 


555 


317 


132 


706 


405 


158 


874 


494 


50 


1 


19 


71 


36 


30 


133 


64 


43 


216 


101 


57 


349 


145 


78 


477 


197 


97 


627 


257 


120 


797 


330 


144 


984 


403 


2 


21 


73 


43 


32 


137 


76 


45 


223 


119 


59 


358 


172 


81 


490 


234 


100 


645 


306 


123 


820 


392 


148 


1,014 


478 


3 


22 


75 


48 


33 


141 


86 


46 


229 


134 


61 


366 


194 


83 


502 


263 


103 


661 


343 


126 


842 


441 


151 


1,043 


538 


100 


1 


18 


82 


37 


28 


158 


66 


40 


262 


104 


53 


442 


150 


73 


611 


204 


91 


810 


266 


112 


1,038 


341 


135 


1,285 


417 


2 


19 


83 


44 


30 


161 


79 


42 


267 


123 


55 


447 


178 


75 


619 


242 


94 


822 


316 


115 


1,054 


405 


139 


1,306 


494 


3 


20 


84 


50 


31 


163 


89 


44 


272 


138 


57 


452 


109 


78 


627 


272 


97 


834 


355 


118 


1,069 


455 


142 


1,327 


555 



COMIWON VENT CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER (D)— inches 


4 


5 


6 


7 


8 


9 


10 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


92 


81 


65 


140 


116 


103 


204 


161 


147 


309 


248 


200 


404 


314 


260 


547 


434 


335 


672 


520 


410 


8 


101 


90 


73 


155 


129 


114 


224 


178 


163 


339 


275 


223 


444 


348 


290 


602 


480 


378 


740 


577 


465 


10 


110 


97 


79 


169 


141 


124 


243 


194 


178 


367 


299 


242 


477 


377 


315 


649 


522 


405 


800 


627 


495 


15 


125 


112 


91 


195 


164 


144 


283 


228 


206 


427 


352 


280 


556 


444 


365 


753 


612 


465 


924 


733 


565 


20 


136 


123 


102 


215 


183 


160 


314 


255 


229 


475 


394 


310 


621 


499 


405 


842 


688 


523 


1,035 


826 


640 


30 


152 


138 


118 


244 


210 


185 


361 


297 


266 


547 


459 


360 


720 


585 


470 


979 


808 


605 


1,209 


975 


740 


50 


167 


153 


134 


279 


244 


214 


421 


353 


310 


641 


547 


423 


854 


706 


550 


1,164 


977 


705 


1,451 


1,188 


860 


100 


175 


163 


NA 


311 


277 


NA 


489 


421 


NA 


751 


658 


479 


1,025 


873 


625 


1,408 


1,215 


800 


1,784 


1,502 


975 



(continued) 



FUEL GAS CODE OF NEW YORK STATE 



95 



CHIMNEYS AND VENTS 



TABLE 504.3(1) — continued 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


TYPE B DOUBLE-WALL VENT AND DIAMETER— (D) inches 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


MIn 


Max 


Max 


MIn 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


174 


764 


496 


223 


1,046 


653 


281 


1,371 


853 


346 


1,772 


1,080 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


180 


897 


616 


230 


1,231 


827 


287 


1,617 


1,081 


352 


2,069 


1,370 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


2 


186 


822 


516 


238 


1,126 


696 


298 


1,478 


910 


365 


1,920 


1,150 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


192 


952 


644 


244 


1,307 


884 


305 


1,719 


1,150 


372 


2,211 


1,460 


471 


2,737 


1,800 


560 


3,319 


2,180 


662 


3,957 


2,590 


6 


198 


1,050 


772 


252 


1,445 


1,072 


313 


1,902 


1,390 


380 


2,434 


1,770 


478 


3,018 


2,180 


568 


3,665 


2,640 


669 


4,373 


3,130 


10 


2 


196 


870 


536 


249 


1,195 


730 


311 


1,570 


955 


379 


2,049 


1,205 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


201 


997 


664 


256 


1,371 


924 


318 


1,804 


1,205 


387 


2,332 


1,535 


486 


2,887 


1,890 


581 


3,502 


2,280 


686 


4,175 


2,710 


6 


207 


1,095 


792 


263 


1,509 


1,118 


325 


1,989 


1,455 


395 


2,556 


1,865 


494 


3,169 


2,290 


589 


3,849 


2,760 


694 


4,593 


3,270 


15 


2 


214 


967 


568 


272 


1,334 


790 


336 


1,760 


1,030 


408 


2,317 


1,305 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


221 


1,085 


712 


279 


1,499 


1,006 


344 


1,978 


1,320 


416 


2,579 


1,665 


523 


3,197 


2,060 


624 


3,881 


2,490 


734 


4,631 


2,960 


6 


228 


1,181 


856 


286 


1,632 


1,222 


351 


2,157 


1,610 


424 


2,796 


2,025 


533 


3,470 


2,510 


634 


4,216 


3,030 


743 


5,035 


3,600 


20 


2 


223 


1,051 


596 


291 


1,443 


840 


357 


1,911 


1,095 


430 


2,533 


1,385 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


230 


1,162 


748 


298 


1,597 


1,064 


365 


2,116 


1,395 


438 


2,778 


1,765 


554 


3,447 


2,180 


661 


4,190 


2,630 


772 


5,005 


3,130 


6 


237 


1,253 


900 


307 


1,726 


1,288 


373 


2,287 


1,695 


450 


2,984 


2,145 


567 


3,708 


2,650 


671 


4,511 


3,190 


785 


5,392 


3,790 


30 


2 


216 


1,217 


632 


286 


1,664 


910 


367 


2,183 


1,190 


461 


2,891 


1,540 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


223 


1,316 


792 


294 


1,802 


1,160 


376 


2,366 


1,510 


474 


3,110 


1,920 


619 


3,840 


2,365 


728 


4,861 


2,860 


847 


5,606 


3,410 


6 


231 


1,400 


952 


303 


1,920 


1,410 


384 


2,524 


1,830 


485 


3,299 


2,340 


632 


4,080 


2,875 


741 


4,976 


3,480 


860 


5,961 


4,150 


50 


2 


206 


1,479 


689 


273 


2,023 


1,007 


350 


2,659 


1,315 


435 


3,548 


1,665 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


213 


1,561 


860 


281 


2,139 


1,291 


359 


2,814 


1,685 


447 


3,730 


2,135 


580 


4,601 


2,633 


709 


5,569 


3,185 


851 


6,633 


3,790 


6 


221 


1,631 


1,031 


290 


2,242 


1,575 


369 


2,951 


2,055 


461 


3,893 


2,605 


594 


4,808 


3,208 


724 


5,826 


3,885 


867 


6,943 


4,620 


100 


2 


192 


1,923 


712 


254 


2,644 


1,050 


326 


3,490 


1,370 


402 


4,707 


1,740 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


200 


1,984 


888 


263 


2,731 


1,346 


336 


3,606 


1,760 


414 


4,842 


2,220 


523 


5,982 


2,750 


639 


7,254 


3,330 


769 


8,650 


3,950 


6 


208 


2,035 


1,064 


272 


2,811 


1,642 


346 


3,714 


2,150 


426 


4,968 


2,700 


539 


6,143 


3,350 


654 


7,453 


4,070 


786 


8,892 


4,810 



COMMON VENT CAPACITY 



VENT 

HEIGHT 

(«) 

(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER— (D) inches 


12 


14 


16 


18 


20 


22 


24 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
-(-FAN 


FAN 
-fNAT 


NAT 
-fNAT 


FAN 
-i-FAN 


FAN 
-kNAT 


NAT 
-fNAT 


FAN 
-(-FAN 


FAN 
-hNAT 


NAT 
-i-NAT 


FAN 
-fFAN 


FAN 
-^NAT 


NAT 
•hNAT 


6 


900 


696 


588 


1,284 


990 


815 


1,735 


1,336 


1,065 


2,253 


1,732 


1,345 


2,838 


2,180 


1,660 


3,488 


2,677 


1970 


4,206 


3,226 


2,390 


8 


994 


773 


652 


1,423 


1,103 


912 


1,927 


1,491 


1,190 


2,507 


1,936 


1,510 


3,162 


2,439 


1,860 


3,890 


2,998 


2,200 


4,695 


3,616 


2,680 


10 


1,076 


841 


712 


1,542 


1,200 


995 


2,093 


1,625 


1,300 


2,727 


2,113 


1645 


3,444 


2,665 


2,030 


4,241 


3,278 


2,400 


5,123 


3,957 


2,920 


15 


1,247 


986 


825 


1,794 


1,410 


1,158 


2,440 


1,910 


1,510 


3,184 


2,484 


1,910 


4,026 


3,133 


2,360 


4,971 


3,862 


2,790 


6,016 


4,670 


3,400 


20 


1,405 


1,116 


916 


2,006 


1,588 


1,290 


2,722 


2,147 


1,690 


3,561 


2,798 


2,140 


4,548 


3,552 


2,640 


5,573 


4,352 


3,120 


6,749 


5,261 


3,800 


30 


1,658 


1,327 


1,025 


2,373 


1,892 


1,525 


3,220 


2,558 


1,990 


4,197 


3,326 


2,520 


5,303 


4,193 


3,110 


6,539 


5,157 


3,680 


7,940 


6,247 


4,480 


50 


2,024 


1,640 


1,280 


2,911 


2,347 


1,863 


3,964 


3,183 


2,430 


5,184 


4,149 


3,075 


6,567 


5,240 


3,800 


8,116 


6,458 


4,500 


9,837 


7,813 


5,475 


100 


2,569 


2,131 


1,670 


3,732 


3,076 


2,450 


5,125 


4,202 


3,200 


6,749 


5,509 


4,050 


8,597 


6,986 


5,000 


10,681 


8,648 


5,920 


13,004 


10,499 


7,200 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



96 



FUEL GAS CODE OF NEW YORK STATE 



CHDWaWEYS kUD VENTS 



TABLE 504.3(2) 
TYPE B DOUBLE-WALL VEMT 



iMumber of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



VENT C0N1\!ECT0R CAPACITY 



VENT 

HEIGHT 

(Hi 

(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


SINGLE-WALL METAL VENT CONNECTOR DIAMETER— (D) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


MaK 


MIn 


Max 


Max 


Min 


Man 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


NA 


NA 


26 


NA 


NA 


46 


NA 


NA 


71 


NA 


NA 


102 


207 


223 


140 


262 


293 


183 


325 


373 


234 


447 


463 


286 


2 


NA 


NA 


31 


NA 


NA 


55 


NA 


NA 


85 


168 


182 


123 


215 


251 


167 


271 


331 


219 


334 


422 


281 


458 


524 


344 


3 


NA 


NA 


34 


NA 


NA 


62 


121 


131 


95 


175 


198 


138 


222 


273 


188 


279 


361 


247 


344 


462 


316 


468 


574 


385 


8 


1 


NA 


NA 


27 


NA 


NA 


48 


NA 


NA 


75 


NA 


NA 


106 


226 


240 


145 


285 


316 


191 


352 


403 


244 


481 


502 


299 


2 


NA 


NA 


32 


NA 


NA 


57 


125 


126 


89 


184 


193 


127 


234 


266 


173 


293 


353 


228 


360 


450 


292 


492 


560 


355 


3 


NA 


NA 


35 


NA 


NA 


64 


130 


138 


100 


191 


208 


144 


241 


287 


197 


302 


381 


256 


370 


489 


328 


501 


609 


400 


10 


1 


NA 


NA 


28 


NA 


NA 


50 


119 


121 


77 


182 


186 


110 


240 


253 


150 


302 


335 


196 


372 


429 


252 


506 


534 


308 


2 


NA 


NA 


33 


84 


85 


59 


124 


134 


91 


189 


203 


132 


248 


278 


183 


311 


369 


235 


381 


473 


302 


517 


589 


368 


3 


NA 


NA 


36 


89 


91 


67 


129 


144 


102 


197 


217 


148 


257 


299 


203 


320 


398 


265 


391 


511 


339 


528 


637 


413 


15 


i 


NA 


NA 


29 


79 


87 


52 


116 


138 


81 


177 


214 


116 


238 


291 


158 


312 


380 


208 


397 


482 


266 


556 


596 


324 


2 


NA 


NA 


34 


83 


94 


62 


121 


150 


97 


185 


230 


138 


246 


314 


189 


321 


411 


248 


407 


522 


317 


568 


646 


387 


3 


NA 


NA 


39 


87 


100 


70 


127 


160 


109 


193 


243 


157 


255 


333 


215 


331 


438 


281 


418 


557 


360 


579 


690 


437 


20 


1 


49 


56 


30 


78 


97 


54 


115 


152 


84 


175 


238 


120 


233 


325 


165 


306 


425 


217 


390 


538 


276 


546 


664 


336 


2 


52 


59 


36 


82 


103 


64 


120 


163 


101 


182 


252 


144 


243 


346 


197 


317 


453 


259 


400 


574 


331 


558 


709 


403 


3 


55 


62 


40 


87 


107 


72 


125 


172 


113 


190 


264 


164 


252 


363 


223 


326 


476 


294 


412 


607 


375 


570 


750 


457 


30 


1 


47 


60 


31 


77 


110 


57 


112 


175 


89 


169 


278 


129 


226 


380 


175 


296 


497 


230 


378 


630 


294 


528 


779 


358 


2 


51 


62 


37 


81 


115 


67 


117 


185 


106 


177 


290 


152 


236 


397 


208 


307 


521 


274 


389 


662 


349 


541 


819 


425 


3 


54 


64 


42 


85 


119 


76 


122 


193 


120 


185 


300 


172 


244 


412 


235 


316 


542 


309 


400 


690 


394 


555 


855 


482 


50 


1 


46 


69 


34 


75 


128 


60 


109 


207 


96 


162 


336 


137 


217 


460 


188 


284 


604 


245 


364 


768 


314 


507 


951 


384 


2 


49 


71 


40 


79 


132 


72 


114 


215 


113 


170 


345 


164 


226 


473 


223 


294 


623 


293 


376 


793 


375 


520 


983 


458 


3 


52 


72 


45 


83 


136 


82 


119 


221 


123 


178 


353 


186 


235 


486 


252 


304 


640 


331 


387 


816 


423 


535 


1,013 


518 


100 


1 


45 


79 


34 


71 


150 


61 


104 


249 


98 


153 


424 


140 


205 


585 


192 


269 


774 


249 


345 


993 


321 


476 


1,236 


393 


2 


48 


80 


41 


75 


153 


73 


no 


255 


115 


160 


428 


167 


212 


593 


228 


279 


788 


299 


358 


1,011 


383 


490 


1,259 


469 


3 


51 


81 


46 


79 


157 


85 


114 


260 


129 


168 


433 


190 


222 


603 


256 


289 


801 


339 


368 


1,027 


431 


506 


1,280 


527 



COMMON VENT CAPACITY 



VENT 

HEIGHT 

(Hi 

(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER— (D) inches 


4 


5 


e 


7 


8 


» 


10 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 

+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


78 


64 


NA 


113 


99 


200 


158 


144 


304 


244 


196 


398 


310 


257 


541 


429 


332 


665 


515 


407 


8 


NA 


87 


71 


NA 


126 


111 


218 


173 


159 


331 


269 


218 


436 


342 


285 


592 


473 


373 


730 


569 


460 


10 


NA 


94 


76 


163 


137 


120 


237 


189 


174 


357 


292 


236 


467 


369 


309 


638 


512 


398 


787 


617 


487 


15 


121 


108 


88 


189 


159 


140 


275 


221 


200 


416 


343 


274 


544 


434 


357 


738 


599 


456 


905 


718 


553 


20 


131 


118 


98 


208 


177 


156 


305 


247 


223 


463 


383 


302 


606 


487 


395 


824 


673 


512 


1,013 


808 


626 


30 


145 


132 


113 


236 


202 


180 


350 


286 


257 


533 


446 


349 


703 


570 


459 


958 


790 


593 


1,183 


952 


723 


50 


159 


145 


128 


268 


233 


208 


406 


337 


296 


622 


529 


410 


833 


686 


535 


1,139 


954 


689 


1,418 


1,157 


838 


100 


166 


153 


NA 


297 


263 


NA 


469 


398 


NA 


726 


633 


464 


999 


846 


606 


1,378 


1,185 


780 


1,741 


1,459 


948 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 



TABLE 504.3(3) 
MASONRY CHIMNEY 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


CONNECTOR 

RISE 

(R) 

(feet) 


TYPE B DOUBLE-WALL VENT CONNECTOR DIAMETER— (D) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


iVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


24 


33 


21 


39 


62 


40 


52 


106 


67 


65 


194 


101 


87 


274 


141 


104 


370 


201 


124 


479 


253 


145 


599 


319 


2 


26 


43 


28 


41 


79 


52 


53 


133 


85 


67 


230 


124 


89 


324 


173 


107 


436 


232 


127 


562 


300 


148 


694 


378 


3 


27 


49 


34 


42 


92 


61 


55 


155 


97 


69 


262 


143 


91 


369 


203 


109 


491 


270 


129 


633 


349 


151 


795 


439 


8 


1 


24 


39 


22 


39 


72 


41 


55 


117 


69 


71 


213 


105 


94 


304 


148 


113 


414 


210 


134 


539 


267 


156 


682 


335 


2 


26 


47 


29 


40 


87 


53 


57 


140 


86 


73 


246 


127 


97 


350 


179 


116 


473 


240 


137 


615 


311 


160 


776 


394 


3 


27 


52 


34 


42 


97 


62 


59 


159 


98 


75 


269 


145 


99 


383 


206 


119 


517 


276 


139 


672 


358 


163 


848 


452 


10 


1 


24 


42 


22 


38 


80 


42 


55 


130 


71 


74 


232 


108 


101 


324 


153 


120 


444 


216 


142 


582 


277 


165 


739 


348 


2 


26 


50 


29 


40 


93 


54 


57 


153 


87 


76 


261 


129 


103 


366 


184 


123 


498 


247 


145 


652 


321 


168 


825 


407 


3 


27 


55 


35 


41 


105 


63 


58 


170 


100 


78 


284 


148 


106 


397 


209 


126 


540 


281 


147 


705 


366 


171 


893 


463 


15 


1 


24 


48 


23 


38 


93 


44 


54 


154 


74 


72 


277 


114 


100 


384 


164 


125 


511 


229 


153 


658 


297 


184 


824 


375 


2 


25 


55 


31 


39 


105 


55 


56 


174 


89 


74 


299 


134 


103 


419 


192 


128 


558 


260 


156 


718 


339 


187 


900 


432 


3 


26 


59 


35 


41 


115 


64 


57 


189 


102 


76 


319 


153 


105 


448 


215 


131 


597 


292 


159 


760 


382 


190 


960 


486 


20 


1 


24 


52 


24 


37 


102 


46 


53 


172 


77 


71 


313 


119 


98 


437 


173 


123 


584 


239 


150 


752 


312 


180 


943 


397 


2 


25 


58 


31 


39 


114 


56 


55 


190 


91 


73 


335 


138 


101 


467 


199 


126 


625 


270 


153 


805 


354 


184 


1,011 


452 


3 


26 


63 


35 


40 


123 


65 


57 


204 


104 


75 


353 


157 


104 


493 


222 


129 


661 


301 


156 


851 


396 


187 


1,067 


505 


30 


1 


24 


54 


25 


37 


111 


48 


52 


192 


82 


69 


357 


127 


96 


504 


187 


119 


680 


255 


145 


883 


337 


175 


1,115 


432 


2 


25 


60 


32 


38 


122 


58 


54 


208 


95 


72 


376 


145 


99 


531 


209 


122 


715 


287 


149 


928 


378 


179 


1,171 


484 


3 


26 


64 


36 


40 


131 


66 


56 


221 


107 


74 


392 


163 


101 


554 


233 


125 


746 


317 


152 


968 


418 


182 


1,220 


535 


50 


1 


23 


51 


25 


36 


116 


51 


51 


209 


89 


67 


405 


143 


92 


582 


213 


115 


798 


294 


140 


1,049 


392 


168 


1,334 


506 


2 


24 


59 


32 


37 


127 


61 


53 


225 


102 


70 


421 


161 


95 


604 


235 


118 


827 


326 


143 


1,085 


433 


172 


1,379 


558 


3 


26 


64 


36 


39 


135 


69 


55 


237 


115 


72 


435 


80 


98 


624 


260 


121 


854 


357 


147 


1,118 


474 


176 


1,421 


611 


100 


1 


23 


46 


24 


35 


108 


50 


49 


208 


92 


65 


428 


155 


88 


640 


237 


109 


907 


334 


134 


1,222 


454 


161 


1,589 


596 


2 


24 


53 


31 


37 


120 


60 


51 


224 


105 


67 


444 


174 


92 


660 


260 


113 


933 


368 


138 


1,253 


497 


165 


1,626 


651 


3 


25 


59 


35 


38 


130 


68 


53 


237 


118 


69 


458 


193 


94 


679 


285 


116 


956 


399 


141 


1,282 


540 


169 


1,661 


705 



COIWMON VENT CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 1 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


74 


25 


NA 


119 


46 


NA 


178 


71 


NA 


257 


103 


NA 


351 


143 


NA 


458 


188 


NA 


582 


246 


1,041 


853 


NA 


8 


NA 


80 


28 


NA 


130 


53 


NA 


193 


82 


NA 


279 


119 


NA 


384 


163 


NA 


501 


218 


724 


636 


278 


1,144 


937 


408 


10 


NA 


84 


31 


NA 


138 


56 


NA 


207 


90 


NA 


299 


131 


NA 


409 


177 


606 


538 


236 


776 


686 


302 


1,226 


1,010 


454 


15 


NA 


NA 


36 


NA 


152 


67 


NA 


233 


106 


NA 


334 


152 


523 


467 


212 


682 


611 


283 


874 


781 


365 


1,374 


1,156 


546 


20 


NA 


NA 


41 


NA 


NA 


75 


NA 


250 


122 


NA 


368 


172 


565 


508 


243 


742 


668 


325 


955 


858 


419 


1,513 


1,286 


648 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


270 


137 


NA 


404 


198 


615 


564 


278 


816 


747 


381 


1,062 


969 


496 


1,702 


1,473 


749 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


620 


328 


879 


831 


461 


1,165 


1,089 


606 


1,905 


1,692 


922 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


348 


NA 


NA 


499 


NA 


NA 


669 


2,053 


1,921 


1,058 



For SI: 1 inch = 25.4 mm, 1 square inch = 645. 16 mn^, 1 foot - 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



98 



FUEL GAS CODE OF NEW YORK STATE 



CHJWiNEYS AND VENTS 



E 504.3(4) 
W CHIMNEY 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


SINGLE-WALL METAL VENT CONNECTOR DIAMETER (D>-inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


iVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


NA 


NA 


21 


NA 


NA 


39 


NA 


NA 


66 


179 


191 


100 


231 


271 


140 


292 


366 


200 


362 


474 


252 


499 


594 


316 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


84 


186 


227 


123 


239 


321 


172 


301 


432 


231 


373 


557 


299 


509 


696 


376 


3 


NA 


NA 


34 


NA 


NA 


61 


134 


153 


97 


193 


258 


142 


247 


365 


202 


309 


491 


269 


381 


634 


348 


519 


793 


437 


8 


1 


NA 


NA 


21 


NA 


NA 


40 


NA 


NA 


68 


195 


208 


103 


250 


298 


146 


313 


407 


207 


387 


530 


263 


529 


672 


331 


2 


NA 


NA 


28 


NA 


NA 


52 


137 


139 


85 


202 


240 


125 


258 


343 


177 


323 


465 


238 


397 


607 


309 


540 


766 


391 


3 


NA 


NA 


34 


NA 


NA 


62 


143 


156 


98 


210 


264 


145 


266 


376 


205 


332 


509 


274 


407 


663 


356 


551 


838 


450 


10 


1 


NA 


NA 


22 


NA 


NA 


41 


130 


151 


70 


202 


225 


106 


267 


316 


151 


333 


434 


213 


410 


571 


273 


558 


727 


343 


2 


NA 


NA 


29 


NA 


NA 


53 


136 


150 


86 


210 


255 


128 


276 


358 


181 


343 


489 


244 


420 


640 


317 


569 


813 


403 


3 


NA 


NA 


34 


97 


102 


62 


143 


166 


99 


217 


277 


147 


284 


389 


207 


352 


530 


279 


430 


694 


363 


580 


880 


459 


15 


1 


NA 


NA 


23 


NA 


NA 


43 


129 


151 


73 


199 


271 


112 


268 


376 


161 


349 


502 


225 


445 


646 


291 


623 


808 


366 


2 


NA 


NA 


30 


92 


103 


54 


135 


170 


88 


207 


295 


132 


277 


411 


189 


359 


548 


256 


456 


706 


334 


634 


884 


424 


3 


NA 


NA 


34 


96 


112 


63 


141 


185 


101 


215 


315 


151 


286 


439 


213 


368 


586 


289 


466 


755 


378 


646 


945 


479 


20 


1 


NA 


NA 


23 


87 


99 


45 


128 


167 


76 


197 


303 


117 


265 


425 


169 


345 


569 


235 


439 


734 


306 


614 


921 


347 


2 


NA 


NA 


30 


91 


111 


55 


134 


185 


90 


205 


325 


136 


274 


455 


195 


355 


610 


266 


450 


787 


348 


627 


986 


443 


3 


NA 


NA 


35 


96 


119 


64 


140 


199 


103 


213 


343 


154 


282 


481 


219 


365 


644 


298 


461 


831 


391 


639 


1,042 


496 


30 


1 


NA 


NA 


24 


86 


108 


47 


126 


187 


80 


193 


347 


124 


259 


492 


183 


338 


665 


250 


430 


864 


330 


600 


1,089 


421 


2 


NA 


NA 


31 


91 


119 


57 


132 


203 


93 


201 


366 


142 


269 


518 


205 


348 


699 


282 


442 


908 


372 


613 


1,145 


473 


3 


NA 


NA 


35 


95 


127 


65 


138 


216 


105 


209 


381 


160 


277 


540 


229 


358 


729 


312 


452 


946 


412 


626 


1,193 


524 


50 


1 


NA 


NA 


24 


85 


113 


50 


124 


204 


87 


188 


392 


139 


252 


567 


208 


328 


778 


287 


417 


1,022 


383 


582 


1,302 


492 


2 


NA 


NA 


31 


89 


123 


60 


130 


218 


100 


196 


408 


158 


262 


588 


230 


339 


806 


320 


429 


1,058 


425 


596 


1,346 


545 


3 


NA 


NA 


35 


94 


131 


68 


136 


231 


112 


205 


422 


176 


271 


607 


255 


349 


831 


351 


440 


1,090 


466 


610 


1,386 


597 


100 


1 


NA 


NA 


23 


84 


104 


49 


122 


200 


89 


182 


410 


151 


243 


617 


232 


315 


875 


328 


402 


1,181 


444 


560 


1,537 


580 


2 


NA 


NA 


30 


88 


115 


59 


127 


215 


102 


190 


425 


169 


253 


636 


254 


326 


899 


361 


415 


1,210 


488 


575 


1,570 


634 


3 


NA 


NA 


34 


93 


124 


67 


133 


228 


115 


199 


438 


188 


262 


654 


279 


337 


921 


392 


427 


1,238 


529 


589 


1,604 


687 



COiWiWON VENT CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) 


12 


19 


28 


38 


50 


83 


78 


113 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


NA 


25 


NA 


118 


45 


NA 


176 


71 


NA 


255 


102 


NA 


348 


142 


NA 


455 


187 


NA 


579 


245 


NA 


846 


NA 


8 


NA 


NA 


28 


NA 


128 


52 


NA 


190 


81 


NA 


276 


118 


NA 


380 


162 


NA 


497 


217 


NA 


633 


277 


1,136 


928 


405 


10 


NA 


NA 


31 


NA 


136 


56 


NA 


205 


89 


NA 


295 


129 


NA 


405 


175 


NA 


532 


234 


171 


680 


300 


1,216 


1,000 


450 


15 


NA 


NA 


36 


NA 


NA 


66 


NA 


230 


105 


NA 


335 


150 


NA 


400 


210 


677 


602 


280 


866 


772 


360 


1,359 


1,139 


540 


20 


NA 


NA 


NA 


NA 


NA 


74 


NA 


247 


120 


NA 


362 


170 


NA 


503 


240 


765 


661 


321 


947 


849 


415 


1,495 


1,264 


640 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


135 


NA 


398 


195 


NA 


558 


275 


808 


739 


377 


1,052 


957 


490 


1,682 


1,447 


740 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


612 


325 


NA 


821 


456 


1,152 


1,076 


600 


1,879 


1,672 


910 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


494 


NA 


NA 


663 


2,006 


1,885 


1,046 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 



TABLE 504.3(5) 
SINGLE-WALL METAL PIPE OR TYPE ASBESTOS CEMENT VENT 



Number of Appliances 


Two or more 


Appliance Type 


Draft hood-equipped 


Appliance Vent Connection 


Direct to pipe or vent 



VENT CONNECTOR CAPACITY 



TOTAL VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 
RISE 

(ff) 
(feet) 


VENT CONNECTOR DIAWIETER— (0) inches 


3 


4 


5 


6 


7 


8 


MAXin/IUM APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6-8 


1 


21 


40 


68 


102 


146 


205 


2 


28 


53 


86 


124 


178 


235 


3 


34 


61 


98 


147 


204 


275 


15 


1 


23 


44 


77 


117 


179 


240 


2 


30 


56 


92 


134 


194 


265 


3 


35 


64 


102 


155 


216 


298 


30 and up 


1 


25 


49 


84 


129 


190 


270 


2 


31 


58 


97 


145 


211 


295 


3 


36 


68 


107 


164 


232 


321 



COMMON VENT CAPACITY 



TOTAL VENT 
HEIGHT 

(H) 
(feet) 


COMMON VENT DIAMbI bR— (D) inches 


4 


5 


6 


7 


8 


10 


12 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6 


48 


78 


111 


155 


205 


320 


NA 


8 


55 


89 


128 


175 


234 


365 


505 


10 


59 


95 


136 


190 


250 


395 


560 


15 


71 


115 


168 


228 


305 


480 


690 


20 


80 


129 


186 


260 


340 


550 


790 


30 


NA 


147 


215 


300 


400 


650 


940 


50 


NA 


NA 


NA 


360 


490 


810 


1,190 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



100 



FUEL GAS CODE OF NEW YORK STATE 



CHIMNEYS AND VENTS 





TABLE 504.3(6) 
EXTERSOR MASONRY CHISVJNEY 


Number of Appliances One 




Appliance Type NAT 




Appliance Vent Connection Type B double-wall connector 


MINIMUM ALLOWABLE INPUT RATING OF SPACE-HEATING APPLIANCE 
IN THOUSANDS OF BTU PER HOUR 


VENT HEIGHT 
(feet) 


Internal area of chimney (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


37°F or Greater 






Local 99% Winter Design Temperature: 37°F or Greater 




6 


























8 


























10 


























15 


NA 























20 


NA 


NA 


123 


190 


249 


184 








30 


NA 


NA 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


27 to 36°F 






Local 99% Winter Design Temperature: 27 to 36°F 




6 








68 


116 


156 


180 


212 


266 


8 








82 


127 


167 


187 


214 


263 


10 





51 


97 


141 


183 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


233 


253 


274 


305 


20 


NA 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


419 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


763 


17 to 26°F 






Local 99% Winter Design Temperature: 17 to 26°F 




6 


NA 


NA 


NA 


NA 


NA 


215 


259 


349 


8 


NA 


NA 


NA 


NA 


197 


226 


264 


352 


10 


NA 


NA 


NA 


NA 


214 


245 


278 


358 


15 


NA 


NA 


NA 


NA 


NA 


296 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


352 


387 


457 


30 


NA 


NA 


NA 


NA 


NA 


NA 


507 


581 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


5 to 16°F 






Local 99% Winter Design Temperature: 5 to 16°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


416 


8 


NA 


NA 


NA 


NA 


NA 


NA 


312 


423 


10 


NA 


NA 


NA 


NA 


NA 


289 


331 


430 


15 


NA 


NA 


NA 


NA 


NA 


NA 


393 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


450 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


972 


-10to4°F 






Local 99% Winter Design Temperature: -10 to 4°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


484 


8 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


494 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


513 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


586 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


650 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


805 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,003 


-11°F or Lower 






Local 99% Winter Design Temperature: -1 1°F or Lower 




Not recommended for any vent configurations 



For SL- °C = [(°F - 32J/1.8, 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 

NOTE: For local 99 percent Winter Design Temperatures refer to "Winter Design Dry-bulb Temperature" column in Table 302. 1 of the Energy Conservation Con- 
struction Code of New York State. 



JEL GAS CODE OF NEW YORK STATE 



101 



CHIMNEYS AND VENTS 



TABLE 504.3(7a) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


NAT + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



Combined Appliance (Vlaximum 
Input Rating in Thousands of Btu per Hour 



VENT 
HEIGHT 




INTERNAL AREA OF CHIMNEY 


(square 


Inches) 




















(feet) 


12 


19 


28 


38 


50 


63 


78 


113 


6 


25 


46 


71 


103 


143 


188 


246 


NA 


8 


28 


53 


82 


119 


163 


218 


278 


408 


10 


31 


56 


90 


131 


177 


236 


302 


454 


15 


NA 


67 


106 


152 


212 


283 


365 


546 


20 


NA 


NA 


NA 


NA 


NA 


325 


419 


648 


30 


NA 


NA 


NA 


NA 


NA 


NA 


496 


749 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


922 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 



TABLE 504.3(7b) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


NAT + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



Minimum Allowable Input Rating of 
Space-Heating Appliance In Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 




INTERNAL AREA OF CHIMNEY 


[square 


inches) 




12 


19 


28 


38 


50 


63 


78 


113 


37°F or 
Greater 


Loc 


al 99% \ 


/VInter D 


esign Tc 


imperati 


ire: 37°F 


■ or Grej 


Iter 


6 























NA 


8 


























10 


























15 


NA 























20 


NA 


NA 


NA 


NA 


NA 


184 








30 


NA 


NA 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


27 to 
36°F 


I 


-ocal 99 


% Winte 


r Design 


Tempe 


'ature: 2 


7 to 36''[ 


: 


6 








68 


NA 


NA 


180 


212 


NA 


8 








82 


NA 


NA 


187 


214 


263 


10 





51 


NA 


NA 


NA 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


NA 


253 


274 


305 


20 


NA 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


NA 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


763 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 



TABLE 504.3(7b)— continued 
EXTERIOR MASONRY CHIMNEY 



Minimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 
HEIGHT 


INTERNAL AREA OF CHIMNEY (square inches) 


















(feet) 


12 


19 


28 


38 


50 


63 


78 


113 


17 to 












26°F 


Local 99% Winter Design Temperature: 17 to 26°F | 


6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA 


NA 


264 


352 


10 


NA 


NA 


NA 


NA 


NA 


NA 


278 


358 


15 


NA 


NA 


NA 


NA 


NA 


NA 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


NA 


387 


457 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


581 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


862 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


5 to 












16T 




Local 99% Winter Design Temperature: 5 to 16°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


430 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4°For 












Lower 


L< 


>cal 99% Winter 


Design Temperature: 4°F or Lower 




N 


ot recommendec 


i for any vent configurations 





For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 
1 square inch = 645.16 mm^, 

1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 
NOTE: For local 99 percent Winter Design Temperatures refer to "Winter De- 
sign Dry-bulb Temperature" column in Table 302. 1 of the Energy Conserva- 
tion Construction Code of New York State. 



(continued) 



102 



FUEL GAS CODE OF NEW YORK STATE 



CHDRffllNlEYS AMD VENTS 



TABLE 504.: 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 

Type 


FAN -1- NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



TABLE 504.3{8b) — contiiinuedl 



Combined Appliance Maximum 

Dnput Rating in Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 


INTERNAL AREA OF CHIMNEY (square inches) 


12 


119 


28 


38 


50 


63 


78 


113 


6 


74 


119 


178 


257 


351 


458 


582 


853 


8 


80 


130 


193 


279 


384 


501 


636 


937 


10 


84 


138 


207 


299 


409 


538 


686 


1,010 


15 


NA 


152 


233 


334 


467 


611 


781 


1,156 


20 


NA 


NA 


250 


368 


508 


668 


858 


1,286 


30 


NA 


NA 


NA 


404 


564 


747 


969 


1,473 


50 


NA 


NA 


NA 


NA 


NA 


831 


1,089 


1,692 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,921 



TABLE 504.3(883) 
EXTER80R MASONRY CHIIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


FAN + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



n/jinimum Allowable Dnput Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 




INTERNAL AREA OF CHIMNEY 


[square inches) 




12 


19 


28 


38 


50 


63 


78 


113 


37°F or 
Greater 


Loc 


al 99% \ 


A/inter D 


esign Tc 


;mperat 


jre: 37°F 


■ or GreJ 


ster 


6 


























8 


























10 


























15 


NA 























20 


NA 


NA 


123 


190 


249 


184 








30 


NA 


NA 


NA 


334 


398 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


714 


707 


579 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,600 


27 to 
36°F 


I 


.ocal 99 


% Winte 


r Design 


Tempe 


rature: 2 


7 to 36°B 


: 


6 








68 


116 


156 


180 


212 


266 


8 








82 


127 


167 


187 


214 


263 


10 





51 


97 


141 


183 


210 


225 


265 


15 


NA 


111 


142 


183 


233 


253 


274 


305 


20 


NA 


NA 


187 


230 


284 


307 


330 


362 


30 


NA 


NA 


NA 


330 


319 


419 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


672 


705 


763 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,554 





Minimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 




VENT 

HEIGHT 
(feet) 


INTERNAL AREA OF CHIMNEY (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


17 to 

26°F 


Local 99% Winter Design Temperature: 17 to 26°F 


6 





55 


99 


141 


182 


215 


259 


349 


8 


52 


74 


111 


154 


197 


226 


264 


352 


10 


NA 


90 


125 


169 


214 


245 


278 


358 


15 


NA 


NA 


167 


212 


263 


296 


331 


398 


20 


NA 


NA 


212 


258 


316 


352 


387 


457 


30 


NA 


NA 


NA 


362 


429 


470 


507 


581 


50 


NA 


NA 


NA 


NA 


NA 


723 


766 


862 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,669 


5 to 

16°F 




Local 99% Winter Design Temperature: 5 to 16°F 


6 


NA 


78 


121 


166 


214 


252 


301 


416 


8 


NA 


94 


135 


182 


230 


269 


312 


423 


10 


NA 


111 


149 


198 


250 


289 


331 


430 


15 


NA 


NA 


193 


247 


305 


346 


393 


485 


20 


NA 


NA 


NA 


293 


360 


408 


450 


547 


30 


NA 


NA 


NA 


377 


450 


531 


580 


682 


50 


NA 


NA 


NA 


NA 


NA 


797 


853 


972 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,833 


-10 to 

4°F 


Local 99% Winter Design Temperature: -10 to 4°F 


6 


NA 


NA 


145 


196 


249 


296 


349 


484 


8 


NA 


NA 


159 


213 


269 


320 


371 


494 


10 


NA 


NA 


175 


231 


292 


339 


397 


513 


15 


NA 


NA 


NA 


283 


351 


404 


457 


586 


20 


NA 


NA 


NA 


333 


408 


468 


528 


650 


30 


NA 


NA 


NA 


NA 


NA 


603 


667 


805 


50 


NA 


NA 


NA 


NA 


NA 


NA 


955 


1,003 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


-11°For 

Lower 


Local 99% Winter Design Temperature: -11°F or Lower 


Not recommended for any vent configurations 



For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 

1 square inch = 645.16 mm'^, 1 foot = 304.8 mm, 
1 British thermal unit per hour = 0.2931 W. 
NOTE: For local 99 percent Winter Design Temperatures refer to "Winter De- 
sign Dry-bulb Temperature" column in Table 302. 1 of the Energy Conserva- 
tion Construction Code of New York State. 



(continued) 

FUEL GAS CODE OF NEW YORK STATE 



103 



1 04 FUEL GAS CODE OF NEW YORK STATE 



SECTION 801 
GEIMERAL 

601.1 Scope. This chapter shall govern the approval, design, 
installation, construction, maintenance, alteration and repair 
of the appliances and equipment specifically identified 
herein. 



places. Fireplaces (sohd fuel type or ANSI Z21.50) 
shall be installed with tight fitting noncombustible fireplace 
doors to control infiltration losses in the construction type 
listed here: 

1 . Masonry or factory-built fireplaces designed to allow 
an open burn. 

2. Whenever a decorative appliance (ANSI Z21.60 
gas-log style unit) is installed in a vented solid fuel fire- 
place. 

3. Vented decorative gas fireplace appliances (ANSI 
Z2 1.50 unit). 

Fireplaces shall be provided with a source of combustion air 
as required by the fireplace construction provisions of the 
Building Code of New York State or the Residential Code of 
New York State. 



devke. All fuel gas space heating ap- 
pliances installed or used in a building occupied as a residence 
shall be equipped with an automatic flame safeguard device 
that shall shut off the fuel supply to the main burner or group of 
burners when the flame or pilot light, thereof, is extinguished. 



Decorative appliances for in- 
stallation in fireplaces shall not be installed where prohibited 
by Section 303.3. 



LOG LIGHTERS 

1,1 GemeraL Log lighters shall be tested in accordance with 
CSA 8 and installed in accordance with the manufacturer's in- 
stallation instructions. 



Automatic valves or semi-automatic 
valves shall be provided and shall comply with the applicable 
provisions of ANSI Z21.21. 



604.1 GeeeraL Vented gas fireplaces shall be tested in accor- 
dance with ANSI Z21.50, shall be installed in accordance with 
the manufacturer's installation instructions and shall be de- 
signed and equipped as specified in Section 602.2. 



i,2 Access. Panels, grilles and access doors that are required 
to be removed for normal servicing operations shall not be at- 
tached to the building. 



FOR INSTALLATIOM IN FIREPLACES 

602.1 GemeraL Decorative appliances for installation in ap- 
proved solid fuel-burning fireplaces shall be tested in accor- 
dance with ANSI Z21.60 and shall be installed in accordance 
with the manufacturer's installation instructions. Manually 
lighted natural gas decorative appliances shall be tested in ac- 
cordance with ANSI Z21.84. 



602.2 Flame safegeard device. Decorative appliances for in- 
stallation in approved solid fuel-burning fireplaces, with the 
exception of those tested in accordance with ANSI Z21.84, 
shall utilize a direct ignition device, an ignitor or a pilot flame 
to ignite the fuel at the main burner, and shall be equipped with 
a flame safeguard device. The flame safeguard device shall 
automatically shut off the fuel supply to a main burner or group 
of burners when the means of ignition of such burners becomes 
inoperative. 



VEMTED GAS FIREPLACE HEATERS 

605.1 GeneraL Vented gas fireplace heaters shall be installed 
in accordance with the manufacturer's installation instructions, 
shall be tested in accordance with ANSI Z21.88 and shall be 
designed and equipped as specified in Section 602.2. 



INCINERATORS AND CREIViATORSES 

GeneraL Incinerators and crematories shall be installed 
in accordance with the manufacturer's installation instructions. 



Commercial-in- 
dustrial-type incinerators shall be constructed and installed in 
accordance with NFPA 82. 



FUEL GAS CODE OF NEW YORK STATE 



105 



SPECIFIC APPLIANCES 



SECTION 608 
VENTED WALL FURNACES 

608.1 GeneraL Vented wall furnaces shall be tested in accor- 
dance with ANSI Z21.49 or Z21.86/CSA 2.32 and shall be in- 
stalled in accordance with the manufacturer's installation 
instructions. 

608.2 Venting. Vented wall furnaces shall be vented in accor- 
dance with Section 503. 

608.3 Location. Vented wall furnaces shall be located so as not 
to cause a fire hazard to walls, floors, combustible furnishings 
or doors. Vented wall furnaces installed between bathrooms 
and adjoining rooms shall not circulate air from bathrooms to 
other parts of the building. 

608.4 Door swing. Vented wall furnaces shall be located so 
that a door cannot swing within 12 inches (305 mm) of an air 
inlet or air outlet of such furnace measured at right angles to the 
opening. Doorstops or door closers shall not be installed to ob- 
tain this clearance. 

608.5 Ducts prohibited. Ducts shall not be attached to wall 
furnaces. Casing extension boots shall not be installed unless 
listed as part of the appliance. 

608.6 Access. Vented wall furnaces shall be provided with ac- 
cess for cleaning of heating surfaces, removal of burners, re- 
placement of sections, motors, controls, filters and other 
working parts, and for adjustments and lubrication of parts re- 
quiring such attention. Panels, grilles and access doors that are 
required to be removed for normal servicing operations shall 
not be attached to the building construction. 



SECTION 609 

FLOOR FURNACES 

609.1 GeneraL Floor furnaces shall be tested in accordance 
with ANSI Z21.48 or Z21.86/CSA 2.32 and shall be installed 
in accordance with the manufacturer's installation instructions. 

609.2 Placement. The following provisions apply to floor fur- 
naces. 

1 . Floors. Floor furnaces shall not be installed in the floor of 
any doorway, stairway landing, aisle or passageway of 
any enclosure, public or private, or in an exitway from 
any such room or space. 

2. Walls and comers. The register of a floor furnace with a 
horizontal warm-air outlet shall not be placed closer than 
6 inches (152 mm) to the nearest wall. A distance of at 
least 18 inches (457 mm) from two adjoining sides of the 
floor furnace register to walls shall be provided to elimi- 
nate the necessity of occupants walking over the 
warm-air discharge. The remaining sides shall be per- 
mitted to be placed not closer than 6 inches (152 mm) to a 
wall. Wall-register models shall not be placed closer than 
6 inches (152 mm) to a corner. 

3. Draperies. The furnace shall be placed so that a door, 
drapery or similar object cannot be nearer than 12 inches 
(305 mm) to any portion of the register of the furnace. 

4. Floor construction. Floor furnaces shall not be installed 
in concrete floor construction built on grade. 



5. Thermostat. The controlling thermostat for a floor fur- 
nace shall be located within the same room or space as 
the floor furnace or shall be located in an adjacent room 
or space that is permanently open to the room or space 
containing the floor furnace. 



^.3 Bracing. The floor around the furnace shall be braced 
and headed with a support framework designed in accordance 
with the Building Code of New York State. 

609.4 Clearance. The lowest portion of the floor furnace shall 
have not less than a 6-inch (152 mm) clearance from the grade 
level; except where the lower 6-inch (152 mm) portion of the 
floor furnace is sealed by the manufacturer to prevent entrance 
of water, the minimum clearance shall be not less than 2 inches 
(51 mm). Where such clearances cannot be provided, the 
ground below and to the sides shall be excavated to form a pit 
under the furnace so that the required clearance is provided be- 
neath the lowest portion of the furnace. A 12-inch (305 mm) 
minimum clearance shall be provided on all sides except the 
control side, which shall have an 18-inch (457 mm) minimum 
clearance. 

609.5 First iFloor installation. Where the basement story level 
below the floor in which a floor furnace is installed is utilized as 
habitable space, such floor furnaces shall be enclosed as speci- 
fied in Section 608.6 and shall project into a nonhabitable 
space. 

609.6 Upper floor installations. Floor furnaces installed in 
upper stories of buildings shall project below into nonhabitable 
space and shall be separated from the nonhabitable space by an 
enclosure constructed of noncombustible materials. The floor 
furnace shall be provided with access, clearance to all sides and 
bottom of not less than 6 inches (152 mm) and combustion air 
in accordance with Section 304. 



SECTION 610 
DUCT FURNACES 

Duct furnaces shall be tested in accordance 
with ANSI Z83.9 or UL 795 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 



1.2 Access panels. Ducts connected to duct furnaces shall 
have removable access panels on both the upstream and down- 
stream sides of the furnace. 

610.3 Location of draft hood and controls. The controls, 
combustion air inlets and draft hoods for duct furnaces shall be 
located outside of the ducts. The draft hood shall be located in 
the same enclosure from which combustion air is taken. 

610.4 Circulating air. Where a duct furnace is installed so that 
supply ducts convey air to areas outside the space containing 
the furnace, the return air shall also be conveyed by a duct(s) 
sealed to the furnace casing and terminating outside the space 
containing the furnace. 

The duct furnace shall be installed on the positive pressure 
side of the circulating air blower. 



106 



FUEL GAS CODE OF NEW YORK STATE 



icimu 61 1 



iRECT=FD 



611.1 GeineraL Nonrecirculating direct-fired industrial air 
heaters shall be listed to ANSI Z83.4/CSA 3.7 and shall be in- 
stalled in accordance with the manufacturer's instructions. 



Bo Nonrecirculating direct-fired industrial air 
heaters shall not be used to supply any area containing sleeping 
quarters. Nonrecirculating direct-fired industrial air heaters 
shall be installed only in industrial or commercial occupancies. 
Nonrecirculating direct-fired industrial air heaters shall be per- 
mitted to provide ventilation air. 

611o3 Clearamce from combesltilble mmalterSals, Non- 
recirculating direct-fired industrial air heaters shall be installed 
with a clearance from combustible materials of not less than 
that shown on the rating plate and in the manufacturer's 
instructions. 



L4 Supply air. All air handled by a nonrecirculating di- 
rect-fired industrial air heater, including combustion air, shall 
be ducted directly from the outdoors. 



611.5 Outdoor anr loevers. If outdoor air louvers of either the 
manual or automatic type are used, such devices shall be 
proven to be in the open position prior to allowing the main 
burners to operate. 



611.6 Atmosplherk veinits amd gai 
Nonrecirculating direct-fired industrial air heaters with valve 
train components equipped with atmospheric vents or gas re- 
liefs or bleeds shall have their atmospheric vent lines or gas re- 
liefs or bleeds lead to the outdoors. Means shall be employed 
on these lines to prevent water from entering and to prevent 
blockage by insects and foreign matter. An atmospheric vent 
line shall not be required to be provided on a valve train compo- 
nent equipped with a listed vent limiter. 



611.7 Relief opemiimg. The design of the installation shall in- 
clude provisions to permit nonrecirculating direct-fired indus- 
trial air heaters to operate at rated capacity without 
overpressurizing the space served by the heaters by taking into 
account the structure's designed infiltration rate, providing 
properly designed relief openings or an interlocked power ex- 
haust system, or a combination of these methods. The struc- 
ture's designed infiltration rate and the size of relief openings 
shall be determined by approved engineering methods. Relief 
openings shall be permitted to be louvers or counterbalanced 
gravity dampers. Motorized dampers or closable louvers shall 
be permitted to be used, provided they are verified to be in their 
full open position prior to main burner operation. 

611.8 Access. Nonrecirculating direct-fired industrial air heat- 
ers shall be provided with access for removal of burners; re- 
placement of motors, controls, filters and other working parts; 
and for adjustment and lubrication of parts requiring mainte- 
nance. 



612.1 Geoeral. Recirculating direct-fired industrial air heaters 
shall be listed to ANSI Z83.18 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 

612.2 Locatiom, Recirculating direct-fired industrial air heat- 
ers shall be installed only in industrial and commercial occu- 
pancies. Recirculating direct-fired air heaters shall not serve 
any area containing sleeping quarters. Recirculating di- 
rect-fired industrial air heaters shall not be installed in hazard- 
ous locations or in buildings that contain flammable solids, 
liquids or gases, explosive materials or substances that can be- 
come toxic when exposed to flame or heat. 



Direct-fired industrial air heaters shall be 
permitted to be installed in accordance with their lisdng and the 
manufacturer's instructions. Direct-fired industrial air heaters 
shall be installed only in industrial or commercial occupancies. 
Direct-fired industrial air heaters shall be permitted to provide 
fresh air ventilation. 



Direct-fired 

industrial air heaters shall be installed with a clearance from 
combustible material of not less than that shown on the label 
and in the manufacturer's instructions. 

612.5 Air supply. Air to direct-fired industrial air heaters shall 
be taken from the building, ducted directly from outdoors, or a 
combination of both. Direct- fired industrial air heaters shall in- 
corporate a means to supply outside ventilation air to the space 
at a rate of not less than 4 cubic feet per minute per 1 ,000 Btu 
per hour (0.38 m^ per min per kW) of rated input of the heater. If 
a separate means is used to supply ventilation air, an interlock 
shall be provided so as to lock out the main burner operation 
until the mechanical means is verified. Where outside air 
dampers or closing louvers are used, they shall be verified to be 
in the open position prior to main burner operation. 

612.6 Altmosplieric vemts, gas reliefs or bleeds. Direct-fired 
industrial air heaters with valve train components equipped 
with atmospheric vents, gas reliefs or bleeds shall have their at- 
mospheric vent lines and gas reliefs or bleeds lead to the out- 
doors. 

Means shall be employed on these hues to prevent water 
from entering and to prevent blockage by insects and foreign 
matter. An atmospheric vent line shall not be required to be pro- 
vided on a valve train component equipped with a listed vent 
limiter. 



mg. Inlet ducting, where used, shall be purged by 
not less than four air changes prior to an ignition attempt. 



612.7 Relief opemiimg. The design of the installation shall in- 
clude adequate provision to permit direct-fired industrial air 
heaters to operate at rated capacity by taking into account the 
structure's designed infiltration rate, providing properly de- 
signed relief openings or an interlocked power exhaust system, 
or a combination of these methods. The structure's designed 
infiltration rate and the size of reUef openings shall be deter- 
mined by approved engineering methods. Relief openings 
shall be permitted to be louvers or counterbalanced gravity 
dampers. Motorized dampers or closable louvers shall be per- 
mitted to be used, provided they are verified to be in their full 
open position prior to main burner operation. 



FUEL GAS CODE OF NEW YORK STATE 



107 



SPECIFIC APPLIANCES 



SECTION 613 
CLOTHES DRYERS 

613.1 General. Clothes dryers shall be tested in accordance 
with ANSI Z2 1.5.1 or ANSI Z21.5.2 and shall be installed in 
accordance with the manufacturer's installation instructions. 



SECTION 614 
CLOTHES DRYER EXHAUST 

614.1 Installation. Clothes dryers shall be exhausted in accor- 
dance with the manufacturer's instructions. Dryer exhaust sys- 
tems shall be independent of all other systems and shall convey 
the moisture and any products of combustion to the outside of 
the building. 

614.2 Duct penetrations. Ducts that exhaust clothes dryers 
shall not penetrate or be located within any fireblocking, 
draftstopping or any wall, floor/ceiling or other assembly re- 
quired by the Building Code of New York State to be fire-resis- 
tance rated, unless such duct is constructed of galvanized steel 
or aluminum of the thickness specified in Table 603.4 of the 
Mechanical Code of New York State and the fire-resistance rat- 
ing is maintained in accordance with the Building Code of New 
York State. Fire dampers, combination fire/smoke dampers and 
any similar device that will obstruct the exhaust flow shall be 
prohibited in clothes dryer exhaust ducts. 

614.3 Cleaning access. Each vertical duct riser for dryers 
listed to ANSI Z21.5.2 shall be provided with a cleanout or 
other means for cleaning the interior of the duct. 

614.4 Exhaust installation. Exhaust ducts for clothes dryers 
shall terminate on the outside of the building and shall be 
equipped with a backdraft damper. Screens shall not be installed 
at the duct termination. Ducts shall not be connected or installed 
with sheet metal screws or other fasteners that will obstruct the 
flow. Clothes dryer exhaust ducts shall not be connected to a 
vent connector, vent or chimney. Clothes dryer exhaust ducts 
shall not extend into or through ducts or plenums. 

614.5 Makeup air. Installations exhausting more than 200 cfm 
(0.09 mVs) shall be provided with makeup air. Where a closet is 
designed for the installation of a clothes dryer, an opening hav- 
ing an area of not less than 100 square inches (645 mm^) for 
makeup air shall be provided in the closet enclosure, or makeup 
air shall be provided by other approved means. 

614.6 Domestic clothes dryer ducts. Exhaust ducts for do- 
mestic clothes dryers shall be constructed of metal and shall 
have a smooth interior finish. The exhaust duct shall be a mini- 
mum nominal size of 4 inches ( 1 02 mm) in diameter. The entire 
exhaust system shall be supported and secured in place. The 
male end of the duct at overlapped duct joints shall extend in 
the direction of airflow. Clothes dryer transition ducts used to 
connect the appliance to the exhaust duct system shall be metal 
and hmited to a single length not to exceed 8 feet (2438 mm) 
and shall be listed and labeled for the application. Transition 
ducts shall not be concealed within construction. 

614.6.1 Maximum length. The maximum length of a 
clothes dryer exhaust duct shall not exceed 25 feet (7620 
mm) from the dryer location to the outlet terminal. The 
maximum length of the duct shall be reduced 2.5 feet (762 



mm) for each 45-degree (0.79 rad) bend and 5 feet (1524 
mm) for each 90-degree (1.6 rad) bend. 

Exception: Where the make and model of the clothes 
dryer to be installed is known and the manufacturer's in- 
stallation instructions for such dryer are provided, the 
maximum length of the exhaust duct, including any tran- 
sition duct, shall be permitted to be in accordance with 
the dryer manufacturer's installadon instructions. 

614.6.2 Ronigh-in required. Where a compartment or 
space for a domestic clothes dryer is provided, an exhaust 
duct system shall be installed. 

614.7 Commercial clothes dryers. The installation of dryer 
exhaust ducts serving Type 2 clothes dryers shall comply with 
the appliance manufacturer's installation instructions. Exhaust 
fan motors installed in exhaust systems shall be located outside 
of the airstream. In multiple installations, the fan shall operate 
continuously or be interlocked to operate when any individual 
unit is operating. Ducts shall have a minimum clearance of 6 
inches (152 mm) to combustible materials. 



SECTION 615 
SAUNA HEATERS 

615.1 General. Sauna heaters shall be installed in accordance 
with the manufacturer's installation instructions. 

615.2 Location and protection. Sauna heaters shall be located 
so as to minimize the possibility of accidental contact by a per- 
son in the room. 

615.2.1 Guards. Sauna heaters shall be protected from ac- 
cidental contact by an approved guard or barrier of material 
having a low coefficient of thermal conductivity. The guard 
shall not substantially affect the transfer of heat from the 
heater to the room. 

615.3 Access. Panels, grilles and access doors that are required 
to be removed for normal servicing operations shall not be at- 
tached to the building. 

615.4 Combustion and dilution air intakes. Sauna heaters of 
other than the direct- vent type shall be installed with the draft 
hood and combustion air intake located outside the sauna room. 
Where the combustion air inlet and the draft hood are in a dress- 
ing room adjacent to the sauna room, there shall be provisions 
to prevent physically blocking the combustion air inlet and the 
draft hood inlet, and to prevent physical contact with the draft 
hood and vent assembly, or warning notices shall be posted to 
avoid such contact. Any warning notice shall be easily read- 
able, shall contrast with its background and the wording shall 
be in letters not less than V4 inch (6.4 mm) high. 

615.5 Combustion and ventilation air. Combustion air shall 
not be taken from inside the sauna room. Combustion and ven- 
tilation air for a sauna heater not of the direct- vent type shall be 
provided to the area in which the combustion air inlet and draft 
hood are located in accordance with Section 304. 

615.6 Heat and time controls. Sauna heaters shall be 
equipped with a thermostat which will hmit room temperature 
to 194°F (90°C). If the thermostat is not an integral part of the 
sauna heater, the heat-sensing element shall be located within 6 
inches ( 1 52 mm) of the ceiling. If the heat-sensing element is a 



108 



FUEL GAS CODE OF NEW YORK STATE 



SPECIFIIC APPLSAEVSCES 



capillary tube and bulb, the assembly shall be attached to the 
wall or other support, and shall be protected against physical 
damage. 

615.6.1 Timers. A timer, if provided to control main burner 
operation, shall have a maximum operating time of 1 hour. 
The control for the timer shall be located outside the sauna 
room. 

615.7 Saeima room, A ventilation opening into the sauna room 
shall be provided. The opening shall be not less than 4 inches 
by 8 inches (102 mm by 203 mm) located near the top of the 
door into the sauna room. 



615.7.1 Warmmg motke. The following permanent notice, 
constructed of approved material, shall be mechanically at- 
tached to the sauna room on the outside: 

WARNING: DO NOT EXCEED 30 MINUTES IN 

SAUNA. EXCESSIVE EXPOSURE CAN BE HARMFUL 
TO HEALTH. ANY PERSON WITH POOR HEALTH 
SHOULD CONSULT A PHYSICIAN BEFORE USING 
SAUNA. 

The words shall contrast with the background and the 
wording shall be in letters not less than 74 inch (6.4 mm) 
high. 

Exceptnom; This section shall not apply to one- and 
two-family dwellings. 



ECTDON616 



616.1 Powered equipment. Permanently installed equipment 
powered by internal combustion engines and turbines shall be 
installed in accordance with the manufacturer's installation in- 
structions and NFPA 37. 



617.1 Gemeral. Pool and spa heaters shall be tested in accor- 
dance with ANSI Z21.56 and shall be installed in accordance 
with the manufacturer's installation instructions. 

617.2 Locatioms. Pool heaters shall be located or protected to 
guard against accidental contact of hot surfaces by persons. 



SECTION 618 
FORCED=AIR WARii=AIR FURNACES 

618.1 Gemeral. Forced-air warm-air furnaces shall be tested in 
accordance with ANSI Z21 .47 or UL 795 and shall be installed 
in accordance with the manufacturer's installation instructions. 



-air fermaces. The minimum unobstructed total 
area of the outside and return air ducts or openings to a 
forced-air warm-air furnace shall be not less than 2 square 
inches for each 1,000 Btu/h (4402 mm^AV) output rating ca- 
pacity of the furnace and not less than that specified in the fur- 
nace manufacturer's installation instructions. The minimum 
unobstructed total area of supply ducts from a forced-air 
warm-air furnace shall be not less than 2 square inches for each 



1,000 Btu/h (4402 mm^AV) output rating capacity of the 
furnace and not less than that specified in the furnace manufac- 
turer's installation instructions. 

Exception; The total area of the supply air ducts and outside 
and return air ducts shall not be required to be larger than the 
minimum size required by the furnace manufacturer's in- 
stallation instructions. 

618.3 Dampers. Volume dampers shall not be placed in the air 
inlet to a furnace in a manner that will reduce the required air to 
the furnace. 



air ducts for forced-air warm=air fer- 
maces. Circulating air for fuel-burning, forced-air-type, 
warm-air furnaces shall be conducted into the blower housing 
from outside the furnace enclosure by continuous air-tight ducts. 

618.5 Prohibited somrces. Outside or return air for a forced-air 
heating system shall not be taken from the following locations: 



1. 



Closer than 10 feet (3048 mm) from an appliance vent 
outlet, a vent opening from a plumbing drainage system 
or the discharge outlet of an exhaust fan, unless the outlet 
is 3 feet (914 mm) above the outside air inlet. 

Where there is the presence of objectionable odors, 
fumes or flammable vapors; or where located less than 
10 feet (3048 mm) above the surface of any abutting pub- 
lic way or driveway; or where located at grade level by a 
sidewalk, street, alley or driveway. 

A hazardous or insanitary location or a refrigeration ma- 
chinery room as defined in the Mechanical Code of New 
York State. 

A room or space, the volume of which is less than 25 per- 
cent of the entire volume served by such system. Where 
connected by a permanent opening having an area sized in 
accordance with Section 61 8.2, adjoining rooms or spaces 
shall be considered as a single room or space for the pur- 
pose of determining the volume of such rooms or spaces. 



Ri The minimum volume requirement shall 
not apply where the amount of return air taken from a 
room or space is less than or equal to the amount of 
supply air delivered to such room or space. 

5. A room or space containing an appliance where such a 
room or space serves as the sole source of return air. 

Exception; This shall not apply where: 

1. The appliance is a direct- vent appliance or an 
appliance not requiring a vent in accordance 
with Section 501.8. 

2. The room or space complies with the following 
requirements: 

2.1. The return air shall be taken from a 
room or space having a volume exceed- 
ing 1 cubic foot for each 10 Btu/h (9.6 
L/W) of combined input rating of all 
fuel-burning appliances therein. 

2.2. The volume of supply air discharged 
back into the same space shall be ap- 
proximately equal to the volume of re- 
turn air taken from the space. 



FUEL GAS CODE OF MEW YORK STATE 



109 



SPECIFIC APPLIANCES 



2.3. Return-air inlets shall not be located 

within 10 feet (3048 mm) of any apph- 

ance firebox or draft hood in the same 

room or space. 

3. Rooms or spaces containing solid fuel-burning 

appliances, provided that return-air inlets are 

located not less than 10 feet (3048 mm) from 

the firebox of such appliances. 

6. A closet, bathroom, toilet room, kitchen, garage, me- 
chanical room, boiler room or furnace room. 

618.6 Screen. Required outdoor air inlets for residential por- 
tions of a building shall be covered with a screen having 
'/4-inch (6.4 mm) openings. Required outdoor air inlets serving 
a nonresidential portion of a building shall be covered with 
screen having openings larger than V4 inch (6.4 mm) and not 
larger than 1 inch (25 mm). 

618.7 Return-air limitation. Return air from one dwelling 
unit shall not be discharged into another dwelling unit. 



SECTION 619 
CONVERSION BURNERS 

619.1 Conversion burners. The installation of conversion 
burners shall conform to ANSI Z21.8. 



SECTION 620 
UNIT HEATERS 

620.1 General. Unit heaters shall be tested in accordance with 
ANSI Z83.8 and shall be installed in accordance with the man- 
ufacturer's installation instructions. 

620.2 Support. Suspended-type unit heaters shall be sup- 
ported by elements that are designed and constructed to accom- 
modate the weight and dynamic loads. Hangers and brackets 
shall be of noncombustible material. 

620.3 Ductwork. Ducts shall not be connected to a unit heater 
unless the heater is listed for such installation. 

620.4 Clearance. Suspended-type unit heaters shall be in- 
stalled with clearances to combustible materials of not less than 
18 inches (457 mm) at the sides, 12 inches (305 mm) at the bot- 
tom and 6 inches (152 mm) above the top where the unit heater 
has an internal draft hood or 1 inch (25 mm) above the top of the 
sloping side of the vertical draft hood. 

Floor-mounted-type unit heaters shall be installed with 
clearances to combustible materials at the back and one side 
only of not less than 6 inches (152 mm). Where the flue gases 
are vented horizontally, the 6-inch (152 mm) clearance shall be 
measured from the draft hood or vent instead of the rear wall of 
the unit heater. Floor-mounted-type unit heaters shall not be in- 
stalled on combustible floors unless listed for such installation. 

Clearances for servicing all unit heaters shall be in accor- 
dance with the manufacturer's installation instructions. 

Exception: Unit heaters hsted for reduced clearance shall 
be permitted to be installed with such clearances in accor- 
dance with their listing and the manufacturer's instructions. 



SECTION 621 
ENTED ROOM HEATERS 

621.1 General. Unvented room heaters shall be tested in accor- 
dance with ANSI Z2 1.1 1.2 and shall be installed in accordance 
with the conditions of the listing and the manufacturer's instal- 
lation instructions. Unvented room heaters utilizing fuels other 
than fuel gas shall be regulated by the Mechanical Code of New 
York State. 

621.2 Prohibited use. One or more unvented room heaters 
shall not be used as the sole source of comfort heating in a 
dwelling unit. 

621.3 Input rating. Unvented room heaters shall not have an 
input rating in excess of 40,000 Btu/h (1 1.7 Kw). 

621.4 Proliilbited locations. Unvented room heaters shall not 
be installed within occupancies in Groups A, E and I. The loca- 
tion of unvented room heaters shall also comply with Section 
303.3. 

621.5 Room or space volume. The aggregate input rating of 
all unvented appliances installed in a room or space shall not 
exceed 20 Btu/h per cubic foot (207 W/m^) of volume of such 
room or space. Where the room or space in which the equip- 
ment is installed is directly connected to another room or space 
by a doorway, archway or other opening of comparable size 
that cannot be closed, the volume of such adjacent room or 
space shall be permitted to be included in the calculations. 

621.6 Oxygen-depletion safety system. Unvented room heat- 
ers shall be equipped with an oxygen-depletion-sensitive 
safety shutoff system. The system shall shut off the gas supply 
to the main and pilot burners when the oxygen in the surround- 
ing atmosphere is depleted to the percent concentration speci- 
fied by the manufacturer, but not lower than 18 percent. The 
system shall not incorporate field adjustment means capable of 
changing the set point at which the system acts to shut off the 
gas supply to the room heater. 

621.7 Unvented log heaters. An unvented log heater shall not 
be installed in a factory-built fireplace unless the fireplace sys- 
tem has been specifically tested, listed and labeled for such use 
in accordance with UL 127. 



SECTION 622 
RENTED ROOM HEATERS 

Vented room heaters shall be tested in accor- 
dance with ANSI Z21 . 1 1 . 1 or ANSI Z21 .86/CS A 2.32, shall be 
designed and equipped as specified in Section 602.2 and shall 
be installed in accordance with the manufacturer's installation 
instructions. 



SECTION 623 
COOKING APPLIANCES 



623.1 Cooking appliances. Cooking appliances that are de- 
signed for permanent installation, including ranges, ovens, 
stoves, broilers, grills, fryers, griddles, hot plates and barbe- 
cues, shall be tested in accordance with ANSI Z21.1, ANSI 
Z21.58 or ANSI Z83.ll and shall be installed in accordance 
with the manufacturer's installation instructions. 



110 



lEL GAS CODE OF NEW YORK STATE 



Cooking appliances designed, 
tested, listed and labeled for use in commercial occupancies 
shall not be installed within dwelling units or within any area 
where domestic cooking operations occur. 

623<,3 DomestHc appMamces. Cooking appliances installed 
within dwelling units and within areas where domestic cooking 
operations occur shall be listed and labeled as household-type 
appliances for domestic use. 



Domestic ranges installed 
on combustible floors shall be set on their own bases or legs and 
shall be installed with clearances of not less than that shown on 
the label. 



h. A ventilating hood shall 
be provided above a domestic open-top broiler unit, unless oth- 
erwise listed for forced down draft ventilation. 



623oS.l Clearamces. A minimum clearance of 24 inches 
(610 mm) shall be maintained between the cooking top and 
combustible material above the hood. The hood shall be at 
least as wide as the open-top broiler unit and be centered 
over the unit. 

623o6 Commeraal cooMmg appliannce veeMego Commercial 
cooking appliances, other than those exempted by Section 
501 .8, shall be vented by connecting the appliance to a vent or 
chimney in accordance with this code and the appliance manu- 
facturer's instructions or the appliance shall be vented in accor- 
dance with Section 505.1.1. 



ECTDOM 624 



Water heaters shall be tested in accordance 
with ANSI Z 2 1.1 0.1 and ANSI Z 2 1.1 0.3 and shall be installed 
in accordance with the manufacturer's installation instructions 
Water heaters utilizing fuels other than fuel gas shall be regu- 
lated by the Mechanical Code of New York State. 

624,1.1 EEStallatiom reqmrememts. The requirements for 
water heaters relative to sizing, relief valves, drain pans and 
scald protection shall be in accordance with the Plumbing 
Code of New York State. 



ng. Water heaters 
utilized both to supply potable hot water and provide hot water 
for space-heating applications shall be listed and labeled for 
such applications by the manufacturer and shall be installed in 
accordance with the manufacturer's installation instructions 
and the Plumbing Code of New York State. 



624o3 Water heaters mstalled im garages. Water heaters hav- 
ing an ignition source shall be elevated such that the source of 
ignition is not less than 18 inches (457 mm) above the garage 
floor. 



ji; Elevation is not required for fuel gas fired appli- 
ances Usted and labeled in accordance with ANSI Z2 1.10.1 
or ANSI Z21 . 10.3 as resistant to flammable vapor ignition. 



625.1 GemeraL Refrigerators shall be tested in accordance 
with ANSI Z2 1 . 1 9 and shall be installed in accordance with the 
manufacturer's installation instructions. 

Refrigerators shall be provided with adequate clearances for 
ventilation at the top and back, and shall be installed in accor- 
dance with the manufacturer's instructions. If such instructions 
are not available, at least 2 inches (5 1 mm) shall be provided 
between the back of the refrigerator and the wall and at least 12 
inches (305 mm) above the top. 



ACTION 626 



ETI 



626.1 Gemeral. Gas-fired toilets shall be tested in accordance 
with ANSI Z21.61 and installed in accordance with the manu- 
facturer's installation instructions. 

626.2 Clearaece, A gas-fired toilet shall be installed in accor- 
dance with its listing and the manufacturer's instructions, pro- 
vided that the clearance shall in any case be sufficient to afford 
ready access for use, cleanout and necessary servicing. 



ECTSOM 627 



IT 



627.1 GeeeraL Gas-fired air-conditioning equipment shall be 
tested in accordance with ANSI Z2 1.40.1 or ANSI Z2 1.40.2 
and shall be installed in accordance with the manufacturer's in- 
stallation instructions. 

627.2 Iinidlepemdemt pipSmig, Gas piping serving heating equip- 
ment shall be permitted to also serve cooling equipment where 
such heating and cooling equipment cannot be operated simul- 
taneously (see Section 402). 

627.3 Coeeectiom off gas engnne-powered air coeditioners. 
To protect against the effects of normal vibration in service, gas 
engines shall not be rigidly connected to the gas supply piping. 

627.4 Clearaoces ffor nmdoor nestallatioe. Air-conditioning 
equipment installed in rooms other than alcoves and closets 
shall be installed with clearances not less than those specified 
in Section 308.3 except that air-conditioning equipment listed 
for installation at lesser clearances than those specified in Sec- 
fion 308.3 shall be permitted to be installed in accordance with 
such listing and the manufacturer's instructions and air-condi- 
tioning equipment listed for installation at greater clearances 
than those specified in Section 308.3 shall be installed in accor- 
dance with such listing and the manufacturer's instructions. 

Air-conditioning equipment installed in rooms other than al- 
coves and closets shall be permitted to be installed with re- 
duced clearances to combustible material, provided that the 
combustible material is protected in accordance with Table 
308.2. 

627.5 Alcove and doset mstallatioim. Air-conditioning equip- 
ment installed in spaces such as alcoves and closets shall be 
specifically listed for such installation and installed in accor- 
dance with the terms of such listing. The installation clearances 



FUEL GAS CODE OF NEW YORK STATE 



111 



SPECIFIC APPLIANCES 



for air-conditioning equipment in alcoves and closets shall not 
be reduced by the protection methods described in Table 308.2. 

627.6 Installation. Air-conditioning equipment shall be in- 
stalled in accordance with the manufacturer's instructions. Un- 
less the equipment is listed for installation on a combustible 
surface such as a floor or roof, or unless the surface is protected 
in an approved manner, equipment shall be installed on a sur- 
face of noncombustible construction with noncombustible ma- 
terial and surface finish and with no combustible material 
against the underside thereof. 

627.7 Plenums and air ducts. A plenum supplied as a part of 
the air-conditioning equipment shall be installed in accordance 
with the equipment manufacturer's instructions. Where a ple- 
num is not supplied with the equipment, such plenum shall be 
installed in accordance with the fabrication and installation in- 
structions provided by the plenum and equipment manufac- 
turer. The method of connecting supply and return ducts shall 
facilitate proper circulation of air. 

Where air-conditioning equipment is installed within a 
space separated from the spaces served by the equipment, the 
air circulated by the equipment shall be conveyed by ducts that 
are sealed to the casing of the equipment and that separate the 
circulating air from the combustion and ventilation air. 

627.8 Refrigeration coils. A refrigeration coil shall not be in- 
stalled in conjunction with a forced-air furnace where circula- 
tion of cooled air is provided by the furnace blower, unless the 
blower has sufficient capacity to overcome the external static 
resistance imposed by the duct system and cooling coil at the 
air throughput necessary for heating or cooling, whichever is 
greater. Furnaces shall not be located upstream from cooling 
units, unless the cooling unit is designed or equipped so as not 
to develop excessive temperature or pressure. Refrigeration 
coils shall be installed in parallel with or on the downstream 
side of central furnaces to avoid condensation in the heating el- 
ement, unless the furnace has been specifically listed for down- 
stream installation. With a parallel flow arrangement, the 
dampers or other means used to control flow of air shall be suf- 
ficiently tight to prevent any circulation of cooled air through 
the furnace. 

Means shall be provided for disposal of condensate and to 
prevent dripping of condensate onto the heating element. 

627.9 Cooling units used with heating boilers. Boilers, 
where used in conjunction with refrigeration systems, shall be 
installed so that the chilled medium is piped in parallel with the 
heating boiler with appropriate valves to prevent the chilled 
medium from entering the heating boiler. Where hot water 
heating boilers are connected to heating coils located in 
air-handling units where they might be exposed to refrigerated 
air circulation, such boiler piping systems shall be equipped 
with flow control valves or other automatic means to prevent 
gravity circulation of the boiler water during the cooling cycle. 

627.10 Switches in electrical supply line. Means for inter- 
rupting the electrical supply to the air-conditioning equipment 
and to its associated cooling tower (if supphed and installed in 
a location remote from the air conditioner) shall be provided 
within sight of and not over 50 feet (15 240 mm) from the air 
conditioner and cooling tower. 



SECTION 628 
ILLUMINATING APPLIANCES 

628.1 General. Illuminating appliances shall be tested in ac- 
cordance with ANSI Z21.42 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 

628.2 Mounting on buildings. Illuminating appliances de- 
signed for wall or ceiling mounting shall be securely attached 
to substantial structures in such a manner that they are not de- 
pendent on the gas piping for support. 

628.3 Mounting on posts. Illuminating appliances designed 
for post mounting shall be securely and rigidly attached to a 
post. Posts shall be rigidly mounted. The strength and rigidity 
of posts greater than 3 feet (914 mm) in height shall be at least 
equivalent to that of a 2'/2-inch-diameter (64 mm) post con- 
structed of 0.064-inch-thick (1.6-mm) steel or a 1-inch (25.4 
mm) Schedule 40 steel pipe. Posts 3 feet (914 mm) or less in 
height shall not be smaller than a V4-inch (19.1 mm) Schedule 
40 steel pipe. Drain openings shall be provided near the base of 
posts where there is a possibility of water collecting inside 
them. 

628.4 Appliance pressure regulators. Where an appliance 
pressure regulator is not supplied with an illuminating appli- 
ance and the service line is not equipped with a service pressure 
regulator, an appliance pressure regulator shall be installed in 
the line to the illuminating appliance. For multiple installa- 
tions, one regulator of adequate capacity shall be permitted to 
serve more than one illuminating appliance. 



SECTION 629 
SMALL CERAMIC KILNS 

629.1 General. Ceramic kilns with a maximum interior vol- 
ume of 20 cubic feet (0.566 m^) and used for hobby and non- 
commercial purposes shall be installed in accordance with the 
manufacturer's installation instructions and the provisions of 
this code. 



SECTION 630 
INFRARED RADIANT HEATERS 

630.1 General. Infrared radiant heaters shall be tested in accor- 
dance with ANSI Z83.6 and shall be installed in accordance 
with the manufacturer's installation instructions. 

630.2 Support. Infrared radiant heaters shall be safely and ad- 
equately fixed in an approved position independent of gas and 
electric supply lines. Hanger and brackets shall be of 
noncombustible material. 



SECTION 631 
BOILERS 

631.1 Standards. Boilers shall be hsted in accordance with the 
requirements of ANSI Z21.13 or UL 795. The boiler shall be 
designed and constructed in accordance with the requirements 
of ASME CSD- 1 and as applicable, the ASME Boiler and 
Pressure Vessel Code, Sections I, II, IV, V and IX and NFPA 85. 



112 



FUEL GAS CODE OF NEW YORK STATE 



SPECIFIC APPUANCES 



Low-pressure boilers are also regulated by the New York 
State Department of Labor, 12 NYCRR, Industrial Code Rule 
4, and high-pressure boilers are also regulated by the New York 
State Department of Labor, 12 NYCRR, Industrial Code Rule 
14. 



n. In addition to the requirements of this code, 
the installation of boilers shall be in accordance with the manu- 
facturer's instructions and the Mechanical Code of New York 
State. Operating instructions of a permanent type shall be at- 
tached to the boiler. Boilers shall have all controls set, adjusted 
and tested by the installer. A complete control diagram together 
with complete boiler operating instructions shall be furnished 
by the installer. The manufacturer's rating data and the name- 
plate shall be attached to the boiler. 

Exceptlom; Mechanical Code of New York State Section 
1007, Low- water cutoff, does not apply where boilers listed 
to ANSI Z21.13 are installed. 

631.3 Ckaramce to comtoMStSlbk materials. Clearances to 
combustible materials shall be in accordance with Section 
308.4. 



SECTIOi^ 634 (IFGS) 
CHSiiS^EY DAIViPER OPEMBWG AREA 

634.1 Free opemlng area off chnmiiiey damnipers. Where an un- 
listed decorative appliance for installation in a vented fireplace 
is installed, the fireplace damper shall have a permanent free 
opening equal to or greater than specified in Table 634. 1 . 



ST IWSTALLED 
VILISTED 



ITI 



Gas equipment installed in existing unlisted 
boilers shall comply with Section 63 1 . 1 and shall be installed in 
accordance with the manufacturer's instructions and the Me- 
chanical Code of New York State. 



FUEL CELL POWER PLANTS 

633.1 Gemeral. Stationary fuel cell power plants haying a 
power output not exceeding 10 MW, shall be tested in accor- 
dance with ANSI CSA America FC 1 and shall be installed in 
accordance with the manufacturer's installation instructions 
and NFPA 853. 



TABLE 634.1 
F CHDMNEY DASVIPER 
FROM yWLlSTED DECORATIVE APPLDAMCES FOR DWS 



VEMT5NG FLUE GASES 

3 VENTED FIREPLACES 



CHIWINEY HEIGHT 
(feet) 


EVJINIMOIVJ PERMANENT FREE OPENiNG (square inches)^ 


8 


13 


20 


29 


39 


51 


64 


Appliance input rating (Btu per hour) 


6 


7,800 


14,000 


23,200 


34,000 


46,400 


62,400 


8,000 


8 


8,400 


15,200 


25,200 


37,000 


50,400 


68,000 


86,000 


10 


9,000 


16,800 


27,600 


40,400 


55,800 


74,400 


96,400 


15 


9,800 


18,200 


30,200 


44,600 


62,400 


84,000 


108,800 


20 


10,600 


20,200 


32,600 


50,400 


68,400 


94,000 


122,200 


30 


11,200 


21,600 


36,600 


55,200 


76,800 


105,800 


138,600 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square inch = 645.16 n^, 1 British thermal unit per hour = 0.2931 W. 

a. The first six minimum permanent free openings (8 to 5 1 square inches) correspond approximately to the cross-sectional areas of chimneys having diameters of 3 
through 8 inches, respectively. The 64-square-inch opening corresponds to the cross-sectional area of standard 8-inch by 8-inch chimn^ tile. 



FUEL GAS CODE OF MEW YORK STATE 



113 



114 FUEL GAS CODE OF NEW YORK STATE 



lASEOUS HYDROGI 



SECTDOW 701 
GEMERAL 

The installation of gaseous hydrogen systems 
shall comply with this chapter and Chapters 30 and 35 of the 
Fire Code of New York State. Compressed gases shall also com- 
ply with Chapter 27 of the Fire Code of New York State for gen- 
eral requirements. Containers provided with pyrophoric 
material shall also comply with Chapter 41 of the Fire Code of 
New York State. Containers having residual gaseous hydrogen 
shall be considered as full for the purposes of the controls 
required. 



I 



I 



I 



IS. The following words and terms shall, for the 
purposes of this chapter and as used elsewhere in this code, 
have the meanings shown herein. 

HYDROGEN CUTOFF ROOM. A room or space which is 
intended exclusively to house a gaseous hydrogen system. 

HYDROGEN=GENERATING APPLIANCE. A self-con- 
tained package or factory-matched packages of integrated sys- 
tems for generating gaseous hydrogen. Hydrogen-generating 
appliances utilize electrolysis, reformation, chemical or other 
processes to generate hydrogen. 

GASEOUS HYDROGEN SYSTEM. An assembly of piping, 
devices and apparatus designed to generate, store, contain, dis- 
tribute or transport a nontoxic, gaseous hydrogen containing 
mixture having at least 95 -percent hydrogen gas by volume and 
not more than 1 -percent oxygen by volume. Gaseous hydrogen 
systems consist of items such as compressed gas containers, re- 
actors and appurtenances, including pressure regulators, pres- 
sure relief devices, manifolds, pumps, compressors and 
interconnecting piping and tubing and controls. 



ITI 



srogem=geinieratlinig amd refinelieg operatioms. Ven- 
tilation shall be required in accordance with Section 703.1.1, 
703. 1 .2 or 703. 1 .3 in public garages, private garages, repair ga- 
rages, automotive service stations and parking garages which 
contain hydrogen-generating appliances or refueling systems. 
Such spaces shall be used for the storage of not more than three 
hydrogen-fueled passenger motor vehicles and have a floor 
area not exceeding 850 square feet (79 m^). The maximum 
rated output capacity of hydrogen-generating appliances shall 
not exceed 4 standard cubic feet per minute (ftVmin) of hydro- 
gen for each 250 square feet (23.2 m^) of floor area in such 
spaces. Such equipment and appliances shall not be installed in 
Group H occupancies except where the occupancy is specifi- 
cally designed for hydrogen use, or in control areas where open 



use, handling or dispensing of combustible, flammable or ex- 
plosive materials occurs. For the purpose of this section, rooms 
or spaces that are not part of the living space of a dwelling unit 
and that communicate directly with a private garage through 
openings shall be considered to be part of the private garage. 

7©3ol.l NataraE ventllaMon. Indoor locations intended for 
hydrogen-generating or refueling operations shall commu- 
nicate with the outdoors in accordance with Sections 
703. 1.1.1 through 703. 1 . 1 .2. The minimum cross-sectional 
dimension of air openings shall be 3 inches (76 mm). Where 
ducts are used, they shall be of the same cross-sectional area 
as the free area of the openings to which they connect. In 
such locations, equipment and appliances having an igni- 
tion source shall be located such that the source of ignition is 
not less than 12 inches (305 mm) below the ceiling. 



.1.1.1 Two openings. Two permanent openings, one 
located entirely within 12 inches (305 mm) of the ceiling 
of the garage, and one located entirely within 12 inches 
(305 mm) of the floor of the garage, shall be provided in 
the same exterior wall. The openings shall communicate 
directly with the outdoors. Each opening shall direcdy 
communicate with the outdoors horizontally, and have a 
minimum free area of ^1^ square foot per 1 ,000 cubic feet 
(1 mV610 m^) of garage volume. 

7(D)3.1ol.2 LoMvers and grilles. In calculating the free 
area required by Section 703.1.1.1, the required size of 
openings shall be based on the net free area of each open- 
ing. If the free area through a design of louver or grille is 
known, it shall be used in calculating the size opening re- 
quired to provide the free area specified. If the design and 
free area are not known, it shall be assumed that wood 
louvers will have 25-percent free area and metal louvers 
and grilles will have 75-percent free area. Louvers and 
grilles shall be fixed in the open position. 

70)3.1,2 Mechanical ventilation. Indoor locations intended 
for hydrogen-generating or refueling operations shall be 
ventilated in accordance with Section 502.16 of the Me- 
chanical Code of New York State. 

703,1.3 Specially engineered installations. As an alterna- 
tive to the provisions of Section 703.1.1 and 703.1.2, the 
necessary supply of air for ventilation and dilution of flam- 
mable gases shall be provided by an approved engineered 
system. 



\ tanks. Compressed gas con- 
tainers, cylinders and tanks shall comply with Chapters 30 and 
35 of the Fire Code of New York State. 

7(0)3,2.1 Limitations for indoor storage and use. Flamma- 
ble gas cylinders in occupancies regulated by the Residen- 
tial Code of New York State shall not exceed 250 cubic feet 
(7.1 m^)at normal temperature and pressure (NTP). 



FUEL GAS CODE OF NEW YORK STATE 



115 



GASEOUS HYDROGEN SYSTEMS 



703.2.2 Design and construction. Compressed gas con- 
tainers, cylinders and tanks shall be designed, constructed 
and tested in accordance with the Chapter 27 of the Fire 
Code of New York State, ASME Boiler and Pressure Vessel 
Code (Section VIII) or DOTn 49 CFR, Parts 100-180. 

703.3 Pressure relief devices. Pressure relief devices shall be 
provided in accordance with Sections 703.3. 1 through 703.3.8. 
Pressure relief devices shall be sized and selected in accor- 
dance with CGA S-1.1, CGA S-1.2 and CGA S-1.3. 

703.3.1 Valves between pressure relief devices and con= 
tainers. Valves including shutoffs, check valves and other 
mechanical restrictions shall not be installed between the 
pressure relief device and container being protected by the 
relief device. 

Exception: A locked-open shutoff valve on containers 
equipped with multiple pressure-relief device installa- 
tions where the arrangement of the valves provides the 
full required flow through the minimum number of re- 
quired relief devices at all times. 

703.3.2 Installation. Valves and other mechanical restric- 
tions shall not be located between the pressure rehef device 
and the point of release to the atmosphere. 

703.3.3 Containers. Containers shall be provided with 
pressure relief devices in accordance with the ASME Boiler 
and Pressure Vessel Code (Section VIII), DOTn 49 CFR, 
Parts 100-180, and Section 703.3.7. 

703.3.4 Vessels other than containers. Vessels other than 
containers shall be protected with pressure relief devices in 
accordance with the ASME Boiler and Pressure Vessel 
Code (Section VIII), or DOTn 49 CFR, Parts 100-180. 

703.3.5 Sizing. Pressure relief devices shall be sized in ac- 
cordance with the specifications to which the container was 
fabricated. The relief device shall be sized to prevent the 
maximum design pressure of the container or system from 
being exceeded. 

703.3.6 Protection. Pressure relief devices and any associ- 
ated vent piping shall be designed, installed and located so 
that their operation will not be affected by water or other de- 
bris accumulating inside the vent or obstructing the vent. 

703.3.7 Access. Pressure relief devices shall be located such 
that they are provided with ready access for inspection and 
repair. 

703.3.8 Configuration. Pressure relief devices shall be ar- 
ranged to discharge unobstructed in accordance with Sec- 
tion 2209 of the Fire Code of New York State. Discharge 
shall be directed to the outdoors in such a manner as to pre- 
vent impingement of escaping gas on personnel, containers, 
equipment and adjacent structures and to prevent introduc- 
tion of escaping gas into enclosed spaces. The discharge 
shall not terminate under eaves or canopies. 

Exception: This section shall not apply to DOTn-speci- 
fied containers with an internal volume of 2 cubic feet 
(0.057 m^) or less. 



703.4 Venting. Relief device vents shall be terminated in an ap- 
proved location in accordance with Section 2209 of the Fire 
Code of New York State. 

703.5 Security. Compressed gas containers, cylinders, tanks 
and systems shall be secured against accidental dislodgement 
in accordance with Chapter 30 of the Fire Code of New York 
State. 

703.6 Electrical wiring and equipment. Electrical wiring and 
equipment shall comply with Chapter 27 of the Building Code 
of New York State. 



SECTION 704 
PIPING, USE AND HANDLING 

704.1 Applicability. Use and handling of containers, cylin- 
ders, tanks and hydrogen gas systems shall comply with this 
section. Gaseous hydrogen systems, equipment and machinery 
shall be hsted or approved. 

704.1.1 Controls. Compressed gas system controls shall be 
designed to prevent materials from entering or leaving pro- 
cess or reaction systems at other than the intended time, rate 
or path. Automatic controls shall be designed to be fail safe 
in accordance with accepted engineering practice. 

704.1.2 Piping systems. Piping, tubing, valves and fittings 
conveying gaseous hydrogen shall be designed and installed 
in accordance with Sections 704.1.2.1 through 704.1.2.5, 
Chapter 27 of the Fire Code of New York State, and ASME 
B3 1 .3. Cast-iron pipe, valves and fittings shall not be used. 

704.1.2.1 Sizing. Gaseous hydrogen piping shall be 
sized in accordance with approved engineering methods. 

704.1.2.2 Identification. Piping used to convey gaseous 
hydrogen shall be identified and marked "HYDRO- 
GEN," at intervals not exceeding 10 feet (3048 mm). Let- 
ters of such marking shall be in a color other than the 
color of the piping. Piping shall be identified a minimum 
of one time in each room or space through which it ex- 
tends. 



1.1.2.3 Piping design and construction. Piping sys- 
tems shall be Type 304, Type 304L or Type 316 stainless 
steel tubing Hsted or approved for hydrogen service and 
the use intended through the full range of pressure and 
temperature to which they will be subjected. Piping sys- 
tems shall be designed and constructed to provide allow- 
ance for expansion, contraction, vibration, settlement 
and fire exposure. 

704.1.2.3.1 Prohibited locations. Piping shall not be 
installed in or through a circulating air duct, clothes 
chute, chimney or gas vent, ventilating duct, dumb- 
waiter or elevator shaft. 

704.1.2.3.2 Piping In solid partitions and walls. 
Concealed piping shall not be located in solid parti- 
tions and solid walls, except where installed in a venti- 
lated chase or casing. 

704.1.2.3.3 Piping in concealed locations. Portions 
of a piping system installed in concealed locations 
shall not have unions, tubing fittings, right or left cou- 



116 



FUEL GAS CODE OF NEW YORK STATE 



GASEOUS HYDROGEN SYSTEMS 



plings, bushings, compression couplings and swing 
joints made by combinations of fittings. 

ExceptSoinis; 

1. Tubing joined by brazing. 

2. Fittings listed for use in concealed locations. 

7®4<.lo23o4 Pipmg ttoroiiiglh ffonmdatioini wai. Under- 
ground piping shall not penetrate the outer foundation 
or basement wall of a building. 



7(II)4ol.2o3.S Protodtnomi agalmst physical damagfio In 
concealed locations, where piping other than stainless 
steel piping, stainless steel tubing or black steel is in- 
stalled through holes or notches in wood studs, joists, 
rafters or similar members less than 1 inch (25 mm) 
from the nearest edge of the member, the pipe shall be 
protected by shield plates. Shield plates shall be a 
minimum of '/,6-inch-thick (1.6 mm) steel, shall cover 
the area of the pipe where the member is notched or 
bored, and shall extend a minimum of 4 inches (102 
mm) above sole plates, below top plates and to each 
side of a stud, joist or rafter. 



704.1o2.3.6 Pnplirag nm solid ioors. Piping in solid 
floors shall be laid in channels in the floor and covered 
in a manner that will allow access to the piping with a 
minimum amount of damage to the building. Where 
such piping is subject to exposure to excessive mois- 
ture or corrosive substances, the piping shall be pro- 
tected in an approved manner. As an alternative to 
installation in channels, the piping shall be installed in 
a casing of Schedule 40 steel, wrought-iron, PVC or 
ABS pipe with tightly sealed ends and joints and the 
casing shall be ventilated to the outdoors. Both ends 
of such casing shall extend not less than 2 inches (51 
mm) beyond the point where the pipe emerges from 
the floor. 



ol.2.3<,7 Pipimg ©miMcKors. Piping installed above 
ground, outdoors, shall be securely supported and lo- 
cated where it will be protected from physical dam- 
age. Piping passing through an exterior wall of a 
building shall be encased in a protective pipe sleeve. 
The annular space between the piping and the sleeve 
shall be sealed from the inside such that the sleeve is 
ventilated to the outdoors. Where passing through an 
exterior wall of a building, the piping shall also be 
protected against corrosion by coating or wrapping 
with an inert material. Below-ground piping shall be 
protected against corrosion. 

7<ID4ol,2o3o8 Settlemeet Piping passing through inte- 
rior concrete or masonry walls shall be protected 
against differential settlement. 

704ol.2„4 JJonmilts. Joints on piping and tubing shall be 
listed for hydrogen service, inclusive of welded, brazed, 
flared, socket, slip or compression fittings. Gaskets and 
sealants shall be listed for hydrogen service. Threaded or 
flanged connections shall not be used in areas other than 
hydrogen cutoff rooms or outdoors. 



Dg compomeinilts. Valves, regu- 
lators and piping components shall be hsted or approved 
for hydrogen service, shall be provided with access and 
shall be designed and constructed to withstand the maxi- 
mum pressure to which such components will be sub- 
jected. 



7M12SA SI 
amd tenkSo Shutoff valves shall be provided on all 
storage container and tank connections except for 
pressure relief devices. Shutoff valves shall be pro- 
vided with ready access. 



hit msec Compressed gas containers, cylinders and 
tanks, except those with a water volume less than 1 .3 gallons (5 
L) and those designed for use in a horizontal position, shall be 
used in an upright position with the valve end up. An upright 
position shall include conditions where the container, cylinder 
or tank axis is incHned as much as 45 degrees (0.79 rad) from 
the vertical. 



regelatioeSo In addition to the re- 
quirements of this section, indoor and outdoor use of hydrogen 
compressed gas shall comply with the material-specific provi- 
sions of Chapters 30 and 35 of theF/re Code of New York State. 



ng. The handling of compressed gas containers, 
cylinders and tanks shall comply with Chapter 27 of the Fire 
Code of New York State. 



Tl 



iMi 



705.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to de- 
termine that the materials, design fabrication and installation 
practices comply with the requirements of this code. 



Inspection shall consist of a visual exami- 
nation of the entire piping system installation and a pressure 
test, prior to system operation. Engineered systems shall be de- 
signed using approved engineering methods and the inspection 
procedures of ASME B3 1 .3, and such inspections shall be veri- 
fied by the code official. 



jslt. The test pressure shall be not less than 1 '/j 
times the proposed maximum working pressure, but not less 
than 5 pounds per square inch gauge (psig) (34.5 kPa gauge), 
irrespective of the design pressure. Where the test pressure ex- 
ceeds 125 psig (862 kPa gauge), the test pressure shall not ex- 
ceed a value that produces hoop stress in the piping greater than 
50 percent of the specified minimum yield strength of the pipe. 
Testing of engineered systems shall utilize the testing proce- 
dures of ASME B3 1 .3 provided that test duration and gauge ac- 
curacy are included in the procedures as specified in Sections 
705.3.1 and 705.3.2. 

7(0)5.3.1 Test deraftiom. The test duration shall not be less 
than V2 hour for each 500 cubic feet (14.2 m^) of pipe vol- 
ume. For piping systems having a volume of more than 
24,000 cubic feet (680 m^), the duration of the test shall not 
be required to exceed 24 hours. 



FUEL GAS CODE OF MEW YORK STATE 



117 



GASEOUS HYDROGEN SYSTEMS 



705.3.2 Test gauges. Gauges used for testing shall be as fol- 
lows: 

1. Tests requiring a pressure of 10 pounds per square 
inch (psi) (68.95 kPa) or less shall utilize a testing 
gauge having increments of 0.10 psi (.6895 kPa) or 
less. 

2. Tests requiring a pressure of greater than 10 psi (68.95 
kPa) but less than or equal to 100 psi (689.5 kPa) shall 
utilize a testing gauge having increments of 1 psi 
(6.895 kPa) or less. 

3. Tests requiring a pressure test greater than 100 psi 
(689.5 kPa) shall utihze a testing gauge having incre- 
ments of 2 psi (13.79 kPa) or less. 

Exception: Measuring devices having an equivalent 
level of accuracy shall be permitted where approved by 
the design engineer and the code enforcement official. 

705.4 Detection of leaks and defects. The piping system shall 
withstand the test pressure specified without showing any evi- 
dence of leakage or other defects. 

705.4.1 Corrections. Where leakage or other defects are lo- 
cated, the affected portion of the piping system shall be re- 
paired and retested. 



SECTION 706 
LOCATION OF GASEOUS HYDROGEN SYSTEMS 

706.1 General. This section shall govern the location and in- 
stallation of gaseous hydrogen systems. 

Exceptions: 

1. Dispensing equipment need not be separated from 
canopies that are constructed in accordance with the 
Building Code of New York State and in a manner that 
prevents the accumulation of hydrogen gas. 

2. Gaseous hydrogen systems located in a separate 
building designed and constructed in accordance with 
the Building Code of New York State and NFPA 50A. 

3. Gaseous hydrogen systems located inside a building 
in a hydrogen cutoff room designed and constructed 
in accordance with Section 706.3 and the Building 
Code of New York State. 

4. Gaseous hydrogen systems located inside a building 
not in a hydrogen cutoff room where the gaseous hy- 
drogen system is listed and labeled for indoor installa- 
tion and installed in accordance with the 
manufacturer's installation instructions. 

5. Stationary fuel-cell power plants in accordance with 
Section 633. 

706.2 Location on property. Gaseous hydrogen systems shall 
be located in accordance with Chapter 22 of the Fire Code of 
New York State. 

706.3 Hydrogen cutoff rooms. Hydrogen cutoff rooms shall 
be designed and constructed in accordance with Sections 
706.3.1 through 706.3.8 and the Building Code of New York 
State. 



706.3.1 Design and construction. Interior building open- 
ings shall be equipped with self-closing devices. Interior 
openings shall be electronically interlocked with the gas- 
eous hydrogen system to prevent operation of the system 
when such openings are ajar or the room shall be provided 
with a mechanical exhaust ventilation system designed with 
a capture velocity at the opening of not less than 60 feet per 
minute (0.3048 m/s). Operable windows are prohibited in 
interior walls. 

706.3.2 Ventilation. Cutoff rooms shall be provided with 
mechanical ventilation in accordance with the applicable 
provisions for repair garages in Chapter 5 of the Building 
Code of New York State. 

Exception: This section shall not apply to rooms provided 
with ventilation systems meeting the requirements of Sec- 
tion 706.3.1. 

706.3.3 Gas detection system. Hydrogen cutoff rooms 
shall be provided with an approved flammable gas-detec- 
tion system in accordance with Sections 706.3.3.1 through 
706.3.3.3. 

706.3.3.1 System design. The flammable gas-detection 
system shall be listed for use with hydrogen and any 
other flammable gases used in the room. The gas detec- 
tion system shall be designed to activate when the level of 
flammable gas exceeds 25 percent of the lower 
flammability limit (LFL) for the gas or mixtures present 
at anticipated temperature and pressure. 

706.3.3.2 Operation. Activation of the gas detection 
system shall result in all of the following: 

1. Initiation of distinct audible and visual alarm sig- 
nals both inside and outside of the cutoff room. 

2. Activation of the mechanical ventilation system. 

706.3.3.3 Failure of the gas detection system. Failure 
of the gas detection system shall result in activation of the 
mechanical ventilation system, cessation of hydrogen 
generation and the sounding of a trouble signal in an ap- 
proved location. 

706.3.4 Ignition source control. Open flames, flame-pro- 
ducing devices and other sources of ignition shall be con- 
trolled in accordance with Chapter 35 of the Fire Code of 
New York State. 

706.3.5 Explosion control. Explosion control shall be pro- 
vided in accordance with Chapter 9 of the Fire Code of New 
York State. 

706.3.6 Standby power. Mechanical ventilation and gas 
detection systems shall be connected to a standby power 
system in accordance with Chapter 27 of the Building Code 
of New York State. 

706.3.7 Smoking. Smoking shall be prohibited in hydrogen 
cutoff rooms. "No Smoking" signs shall be provided at all 
entrances to hydrogen cutoff rooms. 

706.3.8 Housekeeping. The hydrogen cutoff room shall be 
kept free from combustible debris and storage at all times. 



118 



FUEL GAS CODE OF NEW YORK STATE 



GASEOUS HYDROGEM SYSTEtVJS 



iCTIOM 707 



DGEM SYSTEMS 

707.1 MaSmiltemamce. Gaseous hydrogen systems and detection 
devices shall be maintained in accordance with the Fire Code of 
New York State and the manufacturer's installation instruc- 
tions. 

707.2 PergSinig. Purging of gaseous hydrogen systems shall be 
in accordance with Section 2211.8 of the Fire Code of New 
York State. 



iQimn 708 

DGEN SYSTI 



VAPORiZMDOM ©PERMIOWS 

708.1 Geeeral. The design of liquefied hydrogen systems shall 
comply with Chapter 32 of the Fire Code of New York State. 



FUEL GAS CODE OF MEW YORK STATE 1119 



120 FUEL GAS CODE OF NEW YORK STATE 



This chapter hsts the standards that are referenced in various sections of this document. The standards are listed herein by the 
promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this 
document that reference the standard. The application of the referenced standards shall be as specified in Chapter 1 . 

* Denotes standards that are incorporated by reference into 19 NYCRR part 1222. 



American National Standards Institute 

25 West 43rd Street 

Fourtii Floor 

New York, NY 10036 

Referenced 

in code 

Title section number 

Standard Fuel Cell Power Systems 633.1 

Interior Gas Piping Systems Using Corrugated Stainless Steel Tubing 403.5.4 

Household Cooking Gas Appliances 623. 1 

Gas Clothes Dryers -Volume I -Type 1 Clothes Dryers 613.1 

Gas Clothes Dryers -Volume II- Type 2 Clothes Dryers with Z21.5.2a-99 and Z21.5.2b-99 Addenda 613.1,614.3 

Installation ofDomestic Gas Conversion Burners 619.1 

Gas Water Heaters -Volume I -Storage, Water Heaters with Input Ratings of 75 ,000 Btu per Hour or Less 624.1 

Gas Water Heaters - Volume III - Storage, Water Heaters with Input Ratings Above 

75,000Btu per hour. Circulating and Instantaneous Water Heaters — withZ21.10.3a-99 Addendum 624.1 

Gas-Fired Room Heaters -Volume I - Vented Room Heaters — with 

1993 Addendum (Replaced by Z21.86-98/CSA2.32-M98, Vented Gas-Fired Space Heating Appliances) 622.1 

Gas-Fired Room Heaters - Volume II - Unvented Room Heaters 

with Addendum A-97 and Addendum B-98 621.1 

Gas-Fired Low-Pressure Steam and Hot Water Boilers — with 

AddendaZ21.13a-1993andZ21.13b-1994 631.1 

Manually Operated Gas Valves for Appliances, Appliance Connector Valves, and Hose End Valves 409.1.1 

RefrigeratorsUsingGas(R1999)Fuel— with Addenda Z72 1.1 9a- 1992 (R 1999) and Z2 1.1 9b- 1995 (R 1999) 625.1 

Standard for Automatic Valves for Gas Appliances 603.2 

Gas-Fired Heat Activated Air Conditioning and Heat Pump Appliances — with Z21. 40. la-98 Addendum 627.1 

Gas-Fired Work Activated Air Conditioning and Heat Pump 

Appliances (Internal Combustion) — with Z21.40.2a-97 Addendum 627.1 

Gas-Fired Illuminating Appliances 628.1 

Gas-Fired Central Furnaces— with Addendum Z21.47a-00 618.1 

Gas-Fired Gravity and Fan Type Floor Furnaces — with 1993 

Addendum (ReplacedbyZ21.86-98/CSA2.32-]VI98, Vented Gas-FiredSpace Heating Appliances) 609.1 

Gas-Fired Gravity and Fan-Type Vented Wall Furnaces — with 1993 Addendum B-94 

(Replaced by Z21.86-98/CSA2.32-M98, Vented Gas-Fired Space Heating Appliances) 608.1 

Vented Decorative Gas Appliances 604.1 

Gas-FiredPoolHeaters— with Addendum Z21.56a-99 616.1 

Outdoor Cooking Gas Appliances — with Addendum Z2 1.58a- 1998 623.1 

Decorative Gas Appliances for Installation in Solid-Fuel Burning Fireplaces 602.1 

Toilets, Gas-Fired 625.1 

Connectors for Movable Gas Appliances 411.1 

Manually-Lighted, Natural Gas Decorative Gas Appliances for Installation in Solid Fuel Burning Fireplaces 602.1,602.2 

Gas-Fired Vented Space Heating Appliances 608.1,609.1,622.1 

Vented Gas Fireplace Heaters 605. 1 

Non-Recirculating Direct-Gas-Fired Industrial Air Heaters with Addendum Z83.4a-2001 611.1 

Gas-Fired Infrared Heaters 630. 1 

Gas-FiredUnitHeaters— withAddendumZ83.8a-1997 620.1 

Gas-Fired Duct Furnaces 610.1 

Gas Food Service Equipment (Ranges and Unit Broilers), Baking 

and Roasting Ovens, Fat Fryers, Counter Appliances and Kettles, Steam Cookers, and Steam Generators 623.1 



Standard 
reference 
number 



CSA American EC 1—2003 
LC 1—97 
Z21.1— 00 
Z21.5.1— 99 
Z2 1.5.2— 99 
Z2 1.8—94 
Z21.10.1— 01 
Z21.I0.3— 01 

Z21.1 1.1—91 

Z2 1.1 1.2— 96 

Z21. 13—99 

Z2 1.1 5— 97 
Z2 1.1 9— 90 
Z21. 21-95 
Z2 1.40. 1—96 
Z2 1.40.2— 96 

Z2 1.42— 93 
Z2 1.47— 00 
Z2 1.48— 92 

Z2 1.49— 92 

Z2 1.50— 98 

Z2 1.56— 98 

Z21.58— 95 

Z2 1.60— 00 

Z21.61— 83(R1996) 

Z2 1.69— 97 

Z2 1.84— 99 

Z21.86— 98/CSA2.32M98 

Z2 1.88— 99 

Z83.4— 99 

Z83.6— 90(R1998) 

Z83.8— 96 

Z83.9— 96 

Z83.ll— 00 



FUEL GAS CODE OF NEW YORK STATE 



121 



REFERENCED STANDARDS 



Z83.18— 90 



ANSS — continued 
Recirculating Direct Gas-Fired Industrial Air Heaters with Addenda Z83a 2001 and Z83.] 8b 1992 612.1 



ASME 



American Society of Mechanical Engineers 

Three Park Avenue 

New York, NY 10016-5990 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



Bl.20.1— R92 
B16.1— 98 
B 16.20— 98 
B 16.33— 90 
B31.3— 99 
B36.10M— 00 
BPVC— 01 
CSD-1— 98 



Pipe Threads, General Purpose (inch) 403.9 

Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125 and 250 403.12 

Metallic Gaskets for Pipe Flanges Ring-Joint, Spiral-Wound, and Jacketed — with Addendum B 16.20a- 2000 403.12 

Manually Operated Metallic Gas Valves for Use in Gas Piping Systemsupto 1 25 psig (Sizes 1/2 through2) 409.1.1 

Process Piping 704.1.2,705.2,705.3 

Welded and Seamless Wrought-Steel Pipe 403.4.2 

ASME Boiler & Pressure Vessel Code (2001 Edition) 631.1,703.2.2,703.3.3,703.3.4 

Controls and Safety Devices for Automatically Fired Boilers with the ASME CSD-1 a- 1999 Addendum 631.1 



ASTM 



ASTM International 

100 Barr Harbor Drive 

West Conshohocken, PA 19428-2959 

Referenced 

in code 

Title section number 

Specification for Pipe, Steel, BlackandHotDippedZinc-CoatedWeldedandSeamless 403.4.2 

Specification for Seamless Carbon Steel Pipe for High-Temperature Service 403.4.2 

Specification for Copper Brazed Steel Tubing 403.5.1 

Specification for Electric Resistance-Welded Coiled Steel Tubing for Gas and Fuel Oil Lines 403.5.1 

Specification for Seamless Copper Water Tube 403.5.2 

Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes 403.5.3 

Specification for Aluminum and Aluminum-Alloy, Seamless Pipe and Seamless Extruded Tube 403.4.4,403.5.3 

Specification for Seamless Copper Tube for AirConditioningand Refrigeration Field Service 403.5.2 

Withdrawn No Replacement (Specification for Fireclay Brick Refractories for Heavy 

Duty Stationary Boiler Service) 503.10.2.5 

Specification for Clay Flue Linings 501.12 

Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings 403.6, 403.6.1, 403. 11, 404.14.2 



Standard 
reference 
number 



A53/A53M— 01 
A 106—99 
A 254— 97 
A 539— 99 
B 88—99 
B 210— 00 
B241/B241M— 00 
B 280—99 
C64 — 72(1977) 

C 315—00 
D 2513— 01 A 



AWWA 



American Water Works Association 
6666 West Quincy Avenue 
Denver, CO 80235 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



cm— 00 



Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings 403.12 



CGA 



Compressed Gas Association 

1725 Jefferson Davis Highway, 5th Floor 

Adington, VA 22202-4102 

Referenced 

in code 

Title section number 

Pressure Relief Device Standards— Part 1 — Cylinders for Compressed Gases 703.3 

Pressure Relief Device Standards — Part2 — Cargo and Portable Tanks for Compressed Gases 703.3 

Pressure Relief Device Standards — Part 3 — Stationary Storage Containers for Compressed Gases 703.3 



Standard 
reference 
number 



S-1.1— (1994) 
S-1.2— (1995) 
S-1.3— (1995) 



122 



FUEL GAS CODE OF NEW YORK STATE 



CSA America Inc. 

8501 E. Pleasant Valley Rd. 

Cleveland, OH USA 44131-5575 



Standard 
reference 
Partnumber 



Title 



Referenced 

in code 

section number 



CSA 8—93 
(Revision 1,1999) 
American FC 1-2003 



Requirements for Gas-Fired Log Lighters for Wood Burning Fireplaces , 
Standard Fuel Cell Power Systems 



.603.1 
.924.1 



Department of Transportation 
400 Seventh St. SW. 
Washington, DC 20590 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



49 CFR, 

Parts 192.281(e) & 
192.283(b) 
Parts 100-180 



Transportation ofNatural and Other Gas by Pipeline: Minimum Federal Safety Standards 403.6.1 

Hazardous Materials Regulations 703.2.2, 703.3.3, 703.3.4 



Manufacturers Standardization Society of 
the Valve and Fittings Industry 
127 Park Street, Northeast 
Vienna, VA 22180 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



SP-6— 96 
SP-58— 93 



Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings . 
Pipe Hangers and Supports — Materials, Design and Manufacture 



.403.12 
. .407.2 



National Fire Protection Association 

1 Battery march Pike 

P.O. Box 9101 

Quincy, MA 02269-9101 

Referenced 

in code 

Title section number 

Installation and Use ofStationary Combustion Engines and Gas Turbines 616.1 

Gaseous Hydrogen Systems at Consumer Sites 706.1 

Design and Installation ofOxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes 414.1 

National Fuel Gas Code 416.1 

Liquefied Petroleum Gas Code 401.2,402.6.1,403.6.2,403.11 

Incinerators, Waste and Linen Handling Systems and Equipment 607.1 

Boiler and Construction Systems Hazards Code 631.1 

Repair Garages 305.5 

Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances 503.5.2,503.5.3,503.5.6.1,503.5.6.3 

Standard for the Installation of Stationary Fuel Cell Power Plants 633.1 



Standard 
reference 
number 



37—98 
50A— 99 

* 5 1—02 
54—02 
58—01 
82—99 
85—01 
88B— 97 

* 211—00 
853—00 



FUEL GAS CODE OF NEW YORK STATE 



123 



REFERENCED STANDARDS 



UL 



Underwriters Laboratories Inc. 
333 Pfingsten Road 
Northbrook, IL 60062 



Standard Referenced 

reference in code 

number Title section number 

103 — 98 Factory-BuiltChimneys, Residential Type and Building Heating Appliances — with Revisions thru March 1999 506.1 

127 — 96 Factory-Built Fireplaces — with Revisions through November 1999 621.7 

441 — 96 Gas Vents — with Revisions through April 1999 502.1 

641 — 95 Type L Low-Temperature Venting Systems — with Revisions through April 1999 502.1 

795 — 99 Commercial-Industrial Gas Heating Equipment 610.1, 618.1,631.1 

959 — 01 Medium Heat Appliance Factory-BuiltChimneys 506.3 

1738 — 93 Venting Systems for Gas Burning Appliances, Categories II, III and IV with Revisions through December 2000 502.1 

1777—98 Chimney Liners— with Revisions through July 1998 501.12, 501.15.4 



1 24 FUEL GAS CODE OF NEW YORK STATE 



(This appendix is informative and is not part of the code.) 



A,l GemeraD. To determine the size of piping used in a gas pip- 
ing system, the following factors must be considered: 

(1) Allowable loss in pressure from point of delivery to 
equipment 

(2) Maximum gas demand 

(3) Length of piping and number of fittings 

(4) Specific gravity of the gas 

(5) Diversity factor 

For any gas piping system, or special gas utilization equip- 
ment, or for conditions other than those covered by the tables 
provided in this code, such as longer runs, greater gas demands, 
or greater pressure drops, the size of each gas piping system 
should be determined by standard engineering practices ac- 
ceptable to the code official. 

A» 



A.2.1 GemeraL The quantity of gas to be provided at each out- 
let should be determined, whenever possible, directly from the 
manufacturer's British thermal unit (Btu) input rating of the 
equipment that will be installed. In case the ratings of the 
equipment to be installed are not known, Table 402.2 shows the 
approximate consumption (in Btu per hour) of certain types of 
typical household appliances. 

To obtain the cubic feet per hour of gas required, divide the 
total Btu input of all equipment by the average Btu heating 
value per cubic feet of the gas. The average Btu per cubic feet of 
the gas in the area of the installation can be obtained from the 
serving gas supplier. 

A.2.2 Low pressor© mataral gas tables., Capacities for gas at 
low pressure [0.5 psig (3.5 kPa gauge) or less] in cubic feet per 
hour of 0.60 specific gravity gas for different sizes and lengths 
are shown in Tables 402.4(1) and 402.4(2) for iron pipe or 
equivalent rigid pipe, in Tables 402.4(7) through 402.4(9) for 
smooth wall semi-rigid tubing, and in Tables 402.4(14) 
through 402.4(16) for corrugated stainless steel tubing. Tables 
402.4(1) and 402.4(7) are based upon a pressure drop of 
0.3-inch water column (w.c.) (75 Pa), whereas Tables 402.4(2), 
402.4(8) and 402.4(14) are based upon a pressure drop of 
0.5-inch w.c. (125 Pa). Tables 402.4(9), 402.4(15) and 
402.4(16) are special low-pressure apphcations based upon 
pressure drops greater than 0.5-inch w.c. (125 Pa). In using 
these tables, an allowance (in equivalent length of pipe) should 
be considered for any piping run with four or more fittings [see 
Table A.2.2]. 



pipe or equivalent rigid pipe, in Table 402.4(26) for smooth 
wall semirigid tubing, in Table 402.4(28) for corrugated stain- 
less steel tubing, and in Tables 402.4(31) and 402.4(33) for 
polyethylene plastic pipe and tubing. Tables 402.4(29) and 
402.4(30) for corrugated stainless steel tubing and Table 
402.4(32) for polyethylene plastic pipe are based on operating 
pressures greater than 0.5 pounds per square inch (psi) (3.5 
kPa) and pressure drops greater than 0.5-inch w.c. (125 Pa). In 
using these tables, an allowance (in equivalent length of pipe) 
should be considered for any piping run with four or more fit- 
tings [see Table A.2.2]. 

A.2.4 Nataral gas specific gravltjo Gas piping systems that 
are to be supplied with gas of a specific gravity of 0.70 or less 
can be sized directly from the tables provided in this code, un- 
less the code official specifies that a gravity factor be applied. 
Where the specific gravity of the gas is greater than 0.70, the 
gravity factor should be applied. 

Application of the gravity factor converts the figures given in 
the tables provided in this code to capacities for another gas of 
different specific gravity. Such application is accomplished by 
multiplying the capacities given in the tables by the multiphers 
shown in Table A.2.4. In case the exact specific gravity does 
not appear in the table, choose the next higher value specific 
gravity shown. 

TABLE A.2.4 

MULTBPUERS TO BE USED W8TH TABLES 402.4(1) 

THROUGH 402.4(21) WHERE THE SPECIFIC GRAVBTY 

OF THE GAS IS OTHER THAN 0.60 



SPECIFIC 
GRAVITY 


MULTIPLIER 


SPECIFIC 
GRAVITY 


WiULTIPLIER 


.35 


1.31 


1.00 


.78 


.40 


1.23 


1.10 


.74 


.45 


1.16 


1.20 


.71 


.50 


1.10 


1.30 


.68 


.55 


1.04 


1.40 


.66 


.60 


1.00 


1.50 


.63 


.65 


.96 


1.60 


.61 


.70 


.93 


1.70 


.59 


.75 


.90 


1.80 


.58 


.80 


.87 


1.90 


.56 


.85 


.84 


2.00 


.55 


.90 


.82 


2.10 


.54 



Capacities in 

thousands of Btu per hour of undiluted liquefied petroleum 
gases based on a pressure drop of 0.5-inch w.c. (125 Pa) for dif- 
ferent sizes and lengths are shown in Table 402.4(24) for iron 



A.2,5 Mflgher pressure eataral gas tables. Capacities for gas 
at pressures greater than 0.5 psig (3.5 kPa gauge) in cubic feet 
per hour of 0.60 specific gravity gas for different sizes and 
lengths are shown in Tables 402.4(3) through 402.4(6) for iron 



FUEL GAS CODE OF NEW YORK STATE 



125 



APPENDIX A 



TABLE A.2.2 
EQUIVALENT LENGTHS OF PIPE FITTINGS AND VALVES 





SCREWED FITTINGS^ 


90° WELDING ELBOWS AND SMOOTH BENDS^ 


45°/Ell 


90°/Ell 


180° close 
return 
bends 


Tee 


R/d = l 


R/d = IV3 


R/d = 2 


R/d = 4 


R/d = 6 


R/d = S 


/( factor = 


0.42 


0.90 


2.00 


1.80 


0.48 


0.36 


0.27 


0.21 


0.27 


0.36 


Ud ' ratio^ n = 


14 


30 


67 


60 


16 


12 


9 


7 


9 


12 


Nominal 

pipe size, 

inches 


Inside 
diameter d, 

inches, 
Schedule 40^ 




L = Equivalent Length In Feet of Schedule 40 (Standard-Weight) Straight Pipe 


6 




% 


0.622 


0.73 


1.55 


3.47 


3.10 


0.83 


0.62 


0.47 


0.36 


0.47 


0.62 


% 


0.824 


0.96 


2.06 


4.60 


4.12 


1.10 


0.82 


0.62 


0.48 


0.62 


0.82 


1 


1.049 


1.22 


2.62 


5.82 


5.24 


1.40 


1.05 


0.79 


0.61 


0.79 


1.05 


IV4 


1.380 


1.61 


3.45 


7.66 


6.90 


1.84 


1.38 


1.03 


0.81 


1.03 


1.38 


1% 


1.610 


1.88 


4.02 


8.95 


8.04 


2.14 


1.61 


1.21 


0.94 


1.21 


1.61 


2 


2.067 


2.41 


5.17 


11.5 


10.3 


2.76 


2.07 


1.55 


1.21 


1.55 


2.07 


2% 


2.469 


2.88 


6.16 


13.7 


12.3 


3.29 


2.47 


1.85 


1.44 


1.85 


2.47 


3 


3.068 


3.58 


7.67 


17.1 


15.3 


4.09 


3.07 


2.30 


1.79 


2.30 


3.07 


4 


4.026 


4.70 


10.1 


22.4 


20.2 


5.37 


4.03 


3.02 


2.35 


3.02 


4.03 


5 


5.047 


5.88 


12.6 


28.0 


25.2 


6.72 


5.05 


3.78 


2.94 


3.78 


5.05 


6 


6.065 


7.07 


15.2 


33.8 


30.4 


8.09 


6.07 


4.55 


3.54 


4.55 


6.07 


8 


7.981 


9.31 


20.0 


44.6 


40.0 


10.6 


7.98 


5.98 


4.65 


5.98 


7.98 


10 


10.02 


11.7 


25.0 


55.7 


50.0 


13.3 


10.0 


7.51 


5.85 


7.51 


10.0 


12 


11.94 


13.9 


29.8 


66.3 


59.6 


15.9 


11.9 


8.95 


6.96 


8.95 


11.9 


14 


13.13 


15.3 


32.8 


73.0 


65.6 


17.5 


13.1 


9.85 


7.65 


9.85 


13.1 


16 


15.00 


17.5 


37.5 


83.5 


75.0 


20.0 


15.0 


11.2 


8.75 


11.2 


15.0 


18 


16.88 


19.7 


42.1 


93.8 


84.2 


22.5 


16.9 


12.7 


9.85 


12.7 


16.9 


20 


18.81 


22.0 


47.0 


105.0 


94.0 


25.1 


18.8 


14.1 


11.0 


14.1 


18.8 


24 


22.63 


26.4 


56.6 


126.0 


113.0 


30.2 


22.6 


17.0 


13.2 


17.0 


22.6 



continued 



126 



FUEL GAS CODE OF NEW YORK STATE 



APPEMDIX A 









TABLE A.2.2— continued 
EQUIVALENT LEMGTHS OF P8PE FITTINGS AND VALVES 












IWITER ELBOWS^ (No. 


of miters) 




WELDING TEES 


VALVES (screwed, flanged, or 


welded) 


1-45° 


1-60° 


1-90° 


2-90°5 


3-90°^ 


Forged 


Miter^ 


Gate 


Globe 


Angle 


Swing 
Check 


^factors 


0.45 


0.90 


1.80 


0.60 


0.45 


1.35 


1.80 


0.21 


10 


5.0 


2.5 


L/rf' ratio" n = 


15 


30 


60 


20 


15 


45 


60 


7 


333 


167 


83 


iMominal 

pipe size, 

inclies 


Inside 
diameter d, 

inches, 
Schedule 40^ 






L = Equivalent Lengtt- 


In Feet of Schedule 40 (Standard-Weight) Straight Pipe^ 






'/2 


0.622 


0.78 


1.55 


3.10 


1.04 


0.78 


2.33 


3.10 


0.36 


17.3 


8.65 


4.32 


'U 


0.824 


1.03 


2.06 


4.12 


1.37 


1.03 


3.09 


4.12 


0.48 


22.9 


11.4 


5.72 


1 


1.049 


1.31 


2.62 


5.24 


1.75 


1.31 


3.93 


5.24 


0.61 


29.1 


14.6 


7.27 


l'/4 


1.380 


1.72 


3.45 


6.90 


2.30 


1.72 


5.17 


6.90 


0.81 


38.3 


19.1 


9.58 


iv, 


1.610 


2.01 


4.02 


8.04 


2.68 


2.01 


6.04 


8.04 


0.94 


44.7 


22.4 


11.2 


2 


2.067 


2.58 


5.17 


10.3 


3.45 


2.58 


7.75 


10.3 


1.21 


57.4 


28.7 


14.4 


2'/, 


2.469 


3.08 


6.16 


12.3 


4.11 


3.08 


9.25 


12.3 


1.44 


68.5 


34.3 


17.1 


3 


3.068 


3.84 


7.67 


15.3 


5.11 


3.84 


11.5 


15.3 


1.79 


85.2 


42.6 


21.3 


4 


4.026 


5.04 


10.1 


20.2 


6.71 


5.04 


15.1 


20.2 


2.35 


112.0 


56.0 


28.0 


5 


5.047 


6.30 


12.6 


25.2 


8.40 


6.30 


18.9 


25.2 


2.94 


140.0 


70.0 


35.0 


6 


6.065 


7.58 


15.2 


30.4 


10.1 


7.58 


22.8 


30.4 


3.54 


168.0 


84.1 


42.1 


8 


7.981 


9.97 


20.0 


40.0 


13.3 


9.97 


29.9 


40.0 


4.65 


222.0 


111.0 


55.5 


10 


10.02 


12.5 


25.0 


50.0 


16.7 


12.5 


37.6 


50.0 


5.85 


278.0 


139.0 


69.5 


12 


11.94 


14.9 


29.8 


59.6 


19.9 


14.9 


44.8 


59.6 


6.96 


332.0 


166.0 


83.0 


14 


13.13 


16.4 


32.8 


65.6 


21.9 


16.4 


49.2 


65.6 


7.65 


364.0 


182.0 


91.0 


16 


15.00 


18.8 


37.5 


75.0 


25.0 


18.8 


56.2 


75.0 


8.75 


417.0 


208.0 


104.0 


18 


16.88 


21.1 


42.1 


84.2 


28.1 


21.1 


63.2 


84.2 


9.85 


469.0 


234.0 


117.0 


20 


18.81 


23.5 


47.0 


94.0 


31.4 


23.5 


70.6 


94.0 


11.0 


522.0 


261.0 


131.0 


24 


22.63 


28.3 


56.6 


113.0 


37.8 


28.3 


85.0 


113.0 


13.2 


629.0 


314.0 


157.0 



For SI: 1 foot = 305 mm, 1 degree = 0.01745 rad. 

Note: Values for welded fittings are for conditions where bore is not obstructed by weld spatter or backing rings. If appreciably obstructed, use values for "Screwed 
Fittings." 

1. Flanged fittings have three-fourths the resistance of screwed elbows and tees. 

2. Tabular figures give the extra resistance due to curvature alone to which should be added the full length of travel. 

3. Small size socket-welding fittings are equivalent to miter elbows and miter tees. 

4. Equivalent resistance in number of diameters of straight pipe computed for a \alue of (f- 0.0075) from the relation {n - klAj). 

5. For condition of minimum resistance where the centerline length of each miter is between d and 2'/2(/. 

6. For pipe having other inside diameters, the equivalent resistance may be computed from the above n values. 

Source: Crocker, S. Piping Handbook, 4th ed., Table XIV, pp. 100- 101 . Copyright 1945 by McGraw-Hill, Inc. Used by permission of McGraw-Hill Book Company. 



FUEL GAS CODE OF NEW YORK STATE 



127 



APPENDIX A 



pipe or equivalent rigid pipe, Tables 402.4(10) to 402.4(13) for 
semi-rigid tubing, Tables 402.4(17) and 402.4(18) for corru- 
gated stainless steel tubing, and Tables 402.4(19) through 
402.4(21) for polyethylene plastic pipe. 

A.3 Use of capacity tables 

A.3.1 Longest length method. This sizing method is conser- 
vative in its approach by applying the maximum operating con- 
ditions in the system as the norm for the system and by setting 
the length of pipe used to size any given part of the piping sys- 
tem to the maximum value. 

To determine the size of each section of gas piping in a sys- 
tem within the range of the capacity tables, proceed as follows, 
(also see sample calculations included in this appendix). 

(1) Divide the piping system into appropriate segments 
consistent with the presence of tees, branch lines and 
main runs. For each segment, determine the gas load 
(assuming all appliances operate simultaneously) and 
its overall length. An allowance (in equivalent length of 
pipe) as determined from Table A. 2.2 shall be consid- 
ered for piping segments that include four or more 
fittings. 

(2) Determine the gas demand of each appliance to be at- 
tached to the piping system. Where Tables 402.4(1) 
through 402.4(23) are to be used to select the piping 
size, calculate the gas demand in terms of cubic feet per 
hour for each piping system outlet. Where Tables 
402.4(24) through 402.4(33) are to be used to select the 
piping size, calculate the gas demand in terms of thou- 
sands of Btu per hour for each piping system outlet. 

(3) Where the piping system is for use with other than un- 
diluted liquefied petroleum gases, determine the design 
system pressure, the allowable loss in pressure 
(pressure drop), and specific gravity of the gas to be 
used in the piping system. 

(4) Determine the length of piping from the point of deliv- 
ery to the most remote outlet in the building/piping sys- 
tem. 

(5) In the appropriate capacity table, select the row 
showing the measured length or the next longer length 
if the table does not give the exact length. This is the 
only length used in determining the size of any section 
of gas piping. If the gravity factor is to be applied, the 
values in the selected row of the table are multiplied by 
the appropriate multiplier from Table A.2.4. 

(6) Use this horizontal row to locate ALL gas demand fig- 
ures for this particular system of piping. 

(7) Starting at the most remote outlet, find the gas demand 
for that outlet in the horizontal row just selected. If the 
exact figure of demand is not shown, choose the next 
larger figure left in the row. 

(8) Opposite this demand figure, in the first row at the top, 
the correct size of gas piping will be found. 



(9) Proceed in a similar manner for each outlet and each 
section of gas piping. For each section of piping, deter- 
mine the total gas demand supplied by that section. 

When a large number of piping components (such as elbows, 
tees and valves) are installed in a pipe run, additional pressure 
loss can be accounted for by the use of equivalent lengths. Pres- 
sure loss across any piping component can be equated to the 
pressure drop through a length of pipe. The equivalent length of 
a combination of only four elbows/tees can result in a jump to 
the next larger length row, resulting in a significant reduction in 
capacity. The equivalent lengths in feet shown in Table A.2.2 
have been computed on a basis that the inside diameter corre- 
sponds to that of Schedule 40 (standard-weight) steel pipe, 
which is close enough for most purposes involving other 
schedules of pipe. Where a more specific solution for equiva- 
lent length is desired, this may be made by multiplying the ac- 
tual inside diameter of the pipe in inches by nl\2, or the actual 
inside diameter in feet by n (n can be read from the table head- 
ing). The equivalent length values can be used with reasonable 
accuracy for copper or brass fittings and bends although the re- 
sistance per foot of copper or brass pipe is less than that of steel. 
For copper or brass valves, however, the equivalent length of 
pipe should be taken as 45 percent longer than the values in the 
table, which are for steel pipe. 

A.3.2 Branch length method. This sizing method reduces the 
amount of conservatism built into the traditional Longest 
Length Method. The longest length as measured from the me- 
ter to the furthest remote appliance is only used to size the ini- 
tial parts of the overall piping system. The Branch Length 
Method is applied in the following manner: 

(1) Determine the gas load for each of the connected 
appliances. 

(2) Starting from the meter, divide the piping system into a 
number of connected segments, and determine the 
length and amount of gas that each segment would 
carry assuming that all appliances were operated 
simultaneously. An allowance (in equivalent length of 
pipe) as determined from Table A.2.2 should be consid- 
ered for piping segments that include four or more fit- 
tings. 

(3) Determine the distance from the outlet of the gas meter 
to the appliance furthest removed from the meter. 

(4) Using the longest distance (found in Step 3), size each 
piping segment from the meter to the most remote ap- 
pliance outlet. 

(5) For each of these piping segments, use the longest 
length and the calculated gas load for all of the con- 
nected appliances for the segment and begin the sizing 
process in Steps 6 through 8. 

(6) Referring to the appropriate sizing table (based on op- 
erating conditions and piping material), find the longest 
length distance in the first column or the next larger dis- 
tance if the exact distance is not listed. The use of 
alternative operating pressures and/or pressure drops 
will require the use of a different sizing table, but will 
not alter the sizing methodology. In many cases, the use 



128 



FUEL GAS CODE OF NEW YORK STATE 



of alternative operating pressures and/or pressure drops 
will require the approval of both the code official and 
the local gas serving utility. 

(7) Trace across this row until the gas load is found or the 
closest larger capacity if the exact capacity is not listed. 

(8) Read up the table column and select the appropriate 
pipe size in the top row. Repeat Steps 6, 7 and 8 for each 
pipe segment in the longest run. 

(9) Size each remaining section of branch piping not 
previously sized by measuring the distance from the 
gas meter location to the most remote outlet in that 
branch, using the gas load of attached appliances and 
following the procedures of Steps 2 through 8. 



The sizing of a 2 psi (13.8 
kPa) gas piping system is performed using the traditional 
Longest Length Method but with modifications. The 2 psi 
(13.8 kPa) system consists of two independent pressure zones, 
and each zone is sized separately. The Hybrid Pressure Method 
is applied as follows. 

The sizing of the 2 psi (13.8 kPa) section (from the meter to 
the line regulator) is as follows: 

(1) Calculate the gas load (by adding up the name plate 
ratings) from all connected appliances. (In certain 
circumstances the installed gas load may be increased 
up to 50 percent to accommodate future addition of ap- 
pliances.) Ensure that the line regulator capacity is ade- 
quate for the calculated gas load and that the required 
pressure drop (across the regulator) for that capacity 
does not exceed V4 psi (5.2 kPa) for a 2 psi (13.8 kPa) 
system. If the pressure drop across the regulator is too 
high (for the connected gas load), select a larger regula- 
tor. 

(2) Measure the distance from the meter to the line 
regulator located inside the building. 

(3) If there are multiple line regulators, measure the dis- 
tance from the meter to the regulator furthest removed 
from the meter. 

(4) The maximum allowable pressure drop for the 2 psi 
(13.8 kPa) section is 1 psi (6.9 kPa). 

(5) Referring to the appropriate sizing table (based on pip- 
ing material) for 2 psi (13.8 kPa) systems with a 1 psi 
(6.9 kPa) pressure drop, find this distance in the first 
column, or the closest larger distance if the exact dis- 
tance is not listed. 

(6) Trace across this row until the gas load is found or the 
closest larger capacity if the exact capacity is not listed. 

(7) Read up the table column to the top row and select the 
appropriate pipe size. 



(8) If there are multiple regulators in this portion of the 
piping system, each line segment must be sized for its 
actual gas load, but using the longest length previously 
determined above. 

The low pressure section (all piping downstream of the line 
regulator) is sized as follows: 

(1) Determine the gas load for each of the connected 
appliances. 

(2) Starting from the line regulator, divide the piping 
system into a number of connected segments and/or in- 
dependent parallel piping segments, and determine the 
amount of gas that each segment would carry assuming 
that all appliances were operated simultaneously. An 
allowance (in equivalent length of pipe) as determined 
from Table A. 2.2 should be considered for piping seg- 
ments that include four or more fittings. 

(3) For each piping segment, use the actual length or lon- 
gest length (if there are sub-branchlines) and the calcu- 
lated gas load for that segment and begin the sizing 
process as follows: 

(a) Referring to the appropriate sizing table (based 
on operating pressure and piping material), find 
the longest length distance in the first column or 
the closest larger distance if the exact distance is 
not listed. The use of alternative operating pres- 
sures and/or pressure drops will require the use of 
a different sizing table, but will not alter the sizing 
methodology. In many cases, the use of alterna- 
tive operating pressures and/or pressure drops 
may require the approval of the code official. 

(b) Trace across this row until the appliance gas load is 
found or the closest larger capacity if the exact ca- 
pacity is not listed. 

(c) Read up the table column to the top row and select 
the appropriate pipe size. 

(d) Repeat this process for each segment of the piping 
system. 

A A Use off slznnug eqmiatiomSo Capacities of smooth wall pipe or 
tubing can also be determined by using the following formulae: 

(1) High Pressure [1.5 psi (10.3 kPa) and above]: 



2 = 181.6. 



= 2231 D' 



C^ fba-L 
C-L 



FUEL GAS CODE OF MEW YORK STATE 



129 



APPENDIX A 



(2) Low Pressure [Less than L5 psi (10.3 kPa)]: 



TABLE A.5.2 
COPPER TUBE STANDARD 



SIZES 



<2 = 187.3 



2313D' 



D' AH 

C^fbaL 

AH ' 
C-L, 



where: 

Q = Rate, cubic feet per hour at 60°F and 30-inch mercury 
column 

D = Inside diameter of pipe, in. 

Pj = Upstream pressure, psia 

Pj = Downstream pressure, psia 

Y = Superexpansibility factor = 1/supercompressibility factor 

C, = Factor for viscosity, density and temperature* 

= 0.00354 ST 



(f 



Note: See Table 402.4 for Y and C^ for natural gas and 
propane. 

S = Specific gravity of gas at 60°F and 30-inch mercury col- 
umn (0.60 for natural gas, 1 .50 for propane), or = 1488|i 

T = Absolute temperature, °F or = r -i- 460 

t = Temperature, °F 

Z = Viscosity of gas, centipoise (0.012 for natural gas, 0.008 
for propane), or = 1488|i 

jba = Base friction factor for air at 60°F (CF=1) 

L = Length of pipe, ft 

AH= Pressure drop, in. w.c. (27.7 in. H2O = 1 psi) 
(For SI, see Section 402.4) 

A.5 Pipe and tube diameters. Where the internal diameter is 
determined by the formulas in Section 402.4, Tables A.5. 1 and 
A.5.2 can be used to select the nominal or standard pipe size 
based on the calculated internal diameter. 

TABLE A.5.1 
SCHEDULE 40 STEEL PIPE STANDARD SIZES 



NOMINAL SIZE 
(in.) 


INTERNAL 

DIAMETER 

(in.) 


NOMINAL 
SIZE 
(in.) 


INTERNAL 

DIAMETER 

(in.) 


'/4 


0.364 


l'/2 


1.610 


% 


0.493 


2 


2.067 


% 


0.622 


2V, 


2.469 


% 


0.824 


3 


3.068 


1 


L049 


37^ 


3.548 


IV4 


1.380 


4 


4.026 



TUBE TYPE 


NOMINAL OR 

STANDARD SIZE 

inches 


INTERNAL DIAMETER 
inches 


K 


'/4 


0.305 


L 


'/4 


0.315 


ACR (D) 


\ 


0.315 


ACR (A) 


\ 


0.311 


K 


\ 


0.402 


L 


^8 


0.430 


ACR (D) 


'/2 


0.430 


ACR (A) 


\ 


0.436 


K 


Va 


0.527 


L 


% 


0.545 


ACR (D) 


% 


0.545 


ACR (A) 


% 


0.555 


K 


% 


0.652 


L 


% 


0.666 


ACR (D) 


% 


0.666 


ACR (A) 


% 


0.680 


K 


% 


0.745 


L 


'U 


0.785 


ACR 


\ 


0.785 


K 


1 


0.995 


L 


1 


1.025 


ACR 


iVg 


1.025 


K 


1V4 


1.245 


L 


l'/4 


1.265 


ACR 


1% 


1.265 


K 


\% 


1.481 


L 


IV2 


1.505 


ACR 


1% 


1.505 


K 


2 


1.959 


L 


2 


1.985 


ACR 


2Vs 


1.985 


K 


2% 


2.435 


L 


2% 


2.465 


ACR 


2% 


2.465 


K 


3 


2.907 


L 


3 


2.945 


ACR 


3Vs 


2.945 



130 



FUEL GAS CODE OF NEW YORK STATE 



APPENDIX A 



'sizmg clsarte. A third method of sizing gas piping is 
detailed below as an option that is useful when large quantities 
of piping are involved in a job (e.g., an apartment house) and 
material costs are of concern. If the user is not completely fa- 
miliar with this method, the resulting pipe sizing should be 
checked by a knowledgeable gas engineer. The sizing charts 
are applied as follows. 

(1) With the layout developed according to Section 106.3. 1 
of the code, indicate in each section the design gas flow 
under maximum operation conditions. For many lay- 
outs, the maximum design flow will be the sum of all 
connected loads. However, in some cases, certain com- 
binations of utilization equipment will not occur simul- 
taneously (e.g., gas heating and air conditioning). For 
these cases, the design flow is the greatest gas flow that 
can occur at any one time. 

(2) Determine the inlet gas pressure for the system being 
designed. In most cases, the point of inlet will be the gas 
meter or service regulator, but in the case of a system 
addition, it could be the point of connection to the exist- 
ing system. 

(3) Determine the minimum pressure required at the inlet 
to the critical utilization equipment. Usually, the 
critical item will be the piece of equipment with the 



highest required pressure for satisfactory operation. If 
several items have the same required pressure, it will be 
the one with the greatest length of piping from the sys- 
tem inlet. 

(4) The difference between the inlet pressure and critical 
item pressure is the allowable system pressure drop. 
Figures A.6(a) and A.6(b) show the relationship be- 
tween gas flow, pipe size and pipe length for natural gas 
with 0.60 specific gravity. 

(5) To use Figure A.6(a) (low pressure applications), cal- 
culate the piping length from the inlet to the critical 
utilization equipment. Increase this length by 50 per- 
cent to allow for fittings. Divide the allowable pressure 
drop by the equivalent length (in hundreds of feet) to 
determine the allowable pressure drop per hundred 
feet. Select the pipe size from Figure A.6(a) for the re- 
quired volume of flow. 

(6) To use Figure A.6(b) (high pressure applications), 
calculate the equivalent length as above. Calculate the 
index number for Figure A.6(b) by dividing the dif- 
ference between the squares of the absolute values of 
inlet and outlet pressures by the equivalent length (in 
hundreds of feet). Select the pipe size from Figure 
A.6(b) for the gas volume required. 



V2 3/4 1 11/4 11/2 2 2>h 




4000 6000 10,000 



FIGURE A.6 (a) 
MATURAL GAS PIPDNG, LOW PRESSURE (0.60 WC) 



FUEL GAS CODE OF NEW YORK STATE 



131 



APPENDIX A 



Index number = 



Dist, 



^ (100) 



Dist. = Eq. length, ft 

Pj = Initial press, abs. psi 

P2 = Final press, abs. psi 











%" 




1" IV4" 172" 2" 272" 3" 4" 5" 6" 


8" 


10" 




12" 










/ 






' 7 


/ 






/ 




1 




1 






' 


i 


y 


y 






'" 










/ 






' / 


/ 






/ 




/ 




f 




i 






y 


/ 








ti 








/ 






/ 


/ 




J 




i 


/ 


i 






/ 


_^ 


^ > 




/ 








/ 






1 






/ 


/ 


/ 




/ 




f 


/ 


/ 








k 


/ 




f 








6 






/ 






i 


/ 


/ 




/ 




J 


/ 


/ 




1 




f 


/ 


/ 




1 












/ 






1 


/ y 




1 




J 


r 


/ 


/ 




1 




1 


/ 


/ 




f 






4 
3 




/ 


r 




1 




// 




1 




t 




1 y 


1 


1 




y 




/ 


/ 


/ 










/ 




/ 






// 


/ 




/ 




J> 


' / 


1 


/ 


/ 


f 




/ / 




1 










/ 


/ 


/ 






1 
1 


\ 


/ 


/ 




/ 


f 

1 


/ 


1 


/ 


/ 




/ 


^ / 


/ 










9 


/ 


^ 










' 1 


i 






1 




' i 




r 




















/ 


/ 










' / 


i 




















y 














6 


/ 


/ 










/ 


I 










1 / 










f 
















/ 


/ 




y 




i 


/ 


/ 










1 1 








J 




i / 












5 


/ 


/ 




/ 




t 


/ 


( 


i 






^ 










/ 




' / 












^ y 


r 


J 


' 




1 


/ 










/ 








y 






(^ / 












3 
2 


/ 




/ 




/ 




/ 




1 






/ 


I / 






/ 




1 














/ 


/ 


1 


/ 






// 


1 






1 




' 




1 




y 


1 


/ 














/ 


/ 


f 


y 


1 
1 


// 


1 


/ 


/ 




/ 
/ 


7 


/ 


f 


/ 


1 


/ 
y 


i 














/ 


1 






/ 




( ! 




/ 






f 




/ 


J 






















/ 


I 






f 




I 




r 




.< 




i 


/ 


/ 




^ 
















8 


/ 


/ 




A 




y 


/ 








/ 




t 




/ 




/ 
















/ 


/ 


/ 




t 




f 


/ 








f 




/ 




f 




' 


















/ 


/ 




f 




i 


/ 






/ 




/ 


/ 


y 




/ 




















/ y 


f 


/ 




i 


f 


/ 






/ 




/ 


/ 


/ 




/ 


















3 
2 

10 


/ / 




/ 




/ 




/ y 




/ 




l\ 


f 


/ 


/ 


/ 




















/ 


1 




1 




i 


' / 


i 


/ 


/ 


1 








1 




















/. 


/ 


/ 




I 


1 


/ 


L 


L 


/ 




^ 




/ 























1000 



100,000 



1,000,000 



10,000,000 



FIGURE A.6 (b) 
CAPACITY OF NATURAL GAS PIPING, HIGH PRESSURE (1.5 psi and above) 



A.7 Examples of piping system design and sizing 

A.7.1 Example li Longest length method. Determine the re- 
quired pipe size of each section and outlet of the piping system 
shown in Figure A.7.1, with a designated pressure drop of 
0.5-inch w.c. (125 Pa) using the Longest Length Method. The 
gas to be used has 0.60 specific gravity and a heating value of 
1,000 Btu/ft3 (37.5 MJ/m3). 

Solution: 

(1) Maximum gas demand for Outlet A: 

Consumption (rating plate input, or Table 402.2 if necessary) 
Btu of gas 

35,000 Btu per hour rating 

= 35 cubic feet per hour = 35cfh 

1,000 Btu per cubic foot 

Maximum gas demand for Outlet B: 



Maximum gas demand for Outlet D: 



Consumption 100,000 



Btu of gas 



1,000 



= 100 cfh 



Consumption 75,000 



= 75 cfh 



Btu of gas 1,000 
Maximum gas demand for Outlet C: 
Consumption 35,000 



Btu of gas 



1,000 



= 35 cfh 



(2) The length of pipe from the point of delivery to the 
most remote outlet (A) is 60 feet (18 288 mm). This 
is the only distance used. 

(3) Using the row marked 60 feet (18 288 mm) in Table 
402.4(2): 

(a) Outlet A, supplying 35 cfh (0.99 m^/hr), re- 
quires Vg-inch pipe. 

(b) Outlet B, supplying 75 cfh (2.12 m^/hr), re- 
quires V4-inch pipe. 

(c) Section 1, supplying Outlets A and B, or 1 10 
cfh (3.11 m^/hr), requires ^-inch pipe. 

(d) Section 2, supplying Outlets C and D, or 135 
cfh (3.82 m^/hr), requires ^/4-inch pipe. 

(e) Section 3 , supplying Outlets A, B , C and D, or 
245 cfh (6.94 m^/hr), requires 1-inch pipe. 

(4) If a different gravity factor is applied to this exam- 
ple, the values in the row marked 60 feet (18 288 
mm) of Table 402.4(2) would be multiphed by the 
appropriate multiplier from Table A.2.4 and the re- 
sulting cubic feet per hour values would be used to 
size the piping. 



132 



FUEL GAS CODE OF NEW YORK STATE 



Outlet C <>- 

40 gal. automatic 
water heater 
35000 Btu/h 



Sections 
c> 

r 



20 ft 



9 Outlet D 
furnace 
lOOPOOBtu/h 



V Section 2 
r 20fl 

Section 1 
lOfl 



10ft 



15ft 



^ Point of 
delivety 



} 



5 ft 



>15ft 



Outlet A 
clothes dryer 
35000 Btu/h 



Outlet B 6 
range/oven unit 
75P00Btu/h 

E A.7J 



PIPING PLAM SHOWING A STEEL PIPING SYSTEffl 



A.,7.2 Example 2: MybrBd or deal pressmre §y§tem§« Deter- 
mine the required CSST size of each section of the piping sys- 
tem shown in Figure A.7.2, with a designated pressure drop of 
1 psi (6.9 kPa) for the 2 psi (13.8 kPa) section and 3-inch w.c. 
(0.75 kPa) pressure drop for the 13-inch w.c. (2.49 kPa) sec- 
tion. The gas to be used has 0.60 specific gravity and a heating 
value of 1,000 Btu/ft^ (37.5 MJ/ m^). 

Solnitiom 

(1) Size 2 psi (13.8 kPa) line using Table 402.4(17). 

(2) Size 10-inch w.c. (2.5 kPa) lines using Table 402.4(1 5). 

(3) Using the following, determine if sizing tables can be 
used. 

(a) Total gas load shown in Figure A.7.2 equals 110 
cfh(3.11 m^/hr). 

(b) Determine pressure drop across regulator [see 
notes in Table 402.4 (17)]. 

(c) If pressure drop across regulator exceeds V4 psig 
(5.2 kPa), Table 402.4 (17) cannot be used. Note: 
If pressure drop exceeds V4 psi (5.2 kPa), then a 
larger regulator must be selected or an alternative 
sizing method must be used. 

(d) Pressure drop across the line regulator [for 110 
cfh (3.1 1 m3/hr)] is 4-inch w.c. (0.99 kPa) based 
on manufacturer's performance data. 

(e) Assume the CSST manufacturer has tubing sizes 

orEHDsof 13, 18, 23 and 30. 

(4) Section A [2 psi (13.8 kPa) zone] 

(a) Distance from meter to regulator =100 feet (30 
480 mm). 

(b) Total load supplied by A = 1 10 cfh (3.1 1 m^/hr) 
(furnace + water heater -1- dryer). 

(c) Table 402.4 (17) shows that EHD size 18 should 
be used. 

Note: It is not unusual to oversize the supply line 
by 25 to 50 percent of the as-installed load. EHD 
size 18 has a capacity of 189 cfh (5.35 m^/hr). 



(5) Section B (low pressure zone) 

(a) Distance from regulator to furnace is 1 5 feet (4572 
mm). 

(b) Load is 60 cfh (1.70 m^/hr). 

(c) Table 402.4 (15) shows that EHD size 13 should 
be used. 

(6) Section C (low pressure zone) 

(a) Distance from regulator to water heater is 10 
feet (3048 mm). 

(b) Load is 30 cfh (0.85 m^/hr). 

(c) Table 402.4 (15) shows that EHD size 13 should 
be used. 

(7) Section D (low pressure zone) 

(a) Distance from regulator to dryer is 25 feet (7620 
mm). 

(b) Load is 20 cfh (0.57 m^/hr). 

(c) Table 402.4(15) shows that EHD size 13 should 
be used. 



2 psig 

gas meter 

110 cfh 




Length of runs: 


Key: 


A = 100 ft 

B=15ft 

C=10ft 


Mfei Manifold 
X Shut-off valve 


D = 25ft 


^ Pressure regulator 




|m| Gas meter 


FIGURE A.7.2 


PIPING PLAN SHOWING A CSST SYSTEM 



A«7.3 Exampk 3; Branch leegtln method. Determine the re- 
quired semi-rigid copper tubing size of each section of the pip- 
ing system shown in Figure A. 7. 3, with a designated pressure 
drop of 1-inch w.c. (250 Pa) (using the Branch Length 
Method). The gas to be used has 0.60 specific gravity and a 
heating value of 1,000 Btu/ft^ (37.5 MJ/m^). 

Sototionn 

(1) Section A 

(a) The length of tubing from the point of delivery to 
the most remote apphance is 50 feet (15 240 
mm), A + C. 

(b) Use this longest length to size Sections A and C. 

(c) Using the row marked 50 feet (15 240 mm) in Ta- 
ble 402.4(9), Section A, supplying 220 cfh (6.2 
m^/hr) for four appliances requires 1-inch tubing. 



FUEL GAS CODE OF NEW YORK STATE 



133 



APPENDIX A 



(2) Section B 

(a) The length of tubing from the point of deUvery to 
the range/oven at the end of Section B is 30 feet 
(9144 mm), A + B. 

(b) Use this branch length to size Section B only. 

(c) Using the row marked 30 feet (9144 mm) in Ta- 
ble 402.4(9), Section B, supplying 75 cfh (2.12 
m^/hr) for the range/oven requires '/2-inch tub- 
ing. 

(3) Section C 

(a) The length of tubing from the point of delivery to 
the dryer at the end of Section C is 50 feet ( 1 5 240 
mm), A -I- C. 

(b) Use this branch length (which is also the longest 
length) to size Section C. 

(c) Using the row marked 50 feet ( 1 5 240 mm) in Ta- 
ble 402.4(9), Section C, supplying 30 cfh (0.85 
m^/hr) for the dryer requires Vg-inch tubing. 

(4) Section D 

(a) The length of tubing from the point of delivery to 
the water heater at the end of Section D is 30 feet 
(9144 mm), A -^ D. 

(b) Use this branch length to size Section D only. 

(c) Using the row marked 30 feet (9144 mm) in Ta- 
ble 402.4(9), Section D, supplying 35 cfh (0.99 
m^/hr) for the water heater requires Vg-inch tub- 
ing. 

(5) Section E 

(a) The length of tubing from the point of delivery to 
the furnace at the end of Section E is 30 feet 
(9144 mm), A -h E. 

(b) Use this branch length to size Section E only. 

(c) Using the row marked 30 feet (9144 mm) in Ta- 
ble 402.4(9), Section E, supplying 80 cfh (2.26 
m^/hr) for the furnace requires '/2-inch tubing. 



00 R 
00 

Section B T 

Section A ^E~Pl Section D 
~220cfh ^^ /.-^^ Water 

Section E ^f( ) heater 
)( ^-^35cfli 



Fol Range/oven 
00 75 cfh 



Section C 



Furnace 
80 cfh 



D 

Dryer 
30 cfh 



Length of runs; 


Key: 


A = 20 ft 
B = 10ft 
C = 30ft 


llfll Manifold 
X Shut-off valve 


D = 10ft 


1 M 1 Gas meter 


E = 10ft 


Total gas load = 220 cfh 



A.7.4 Example 4: Modification to existing piping system. 

Determine the required CSST size for Section G (retrofit appli- 
cation) of the piping system shown in Figure A.7.4, with a des- 
ignated pressure drop of 0.5-inch w.c. (125 Pa) using the 
branch length method. The gas to be used has 0.60 specific 
gravity and a heating value of 1,000 Btu/ft^ (37.5 MJ/m^). 

Solution 

( 1 ) The length of pipe and CSST from the point of delivery 
to the retrofit appliance (barbecue) at the end of Section 
G is 40 feet (12 192 mm), A -h B -h G. 

(2) Use this branch length to size Section G. 

(3) Assume the CSST manufacturer has tubing sizes or 
EHDs of 13, 18, 23 and 30. 

(4) Using the row marked 40 feet (12 192 mm) in Table 
402.4(14), Section G, supplying 40 cfh ( 1 . 1 3 m^/hr) for 
the barbecue requires EHD 18 CSST. 

(5) The sizing of Sections A, B, F and E must be checked to 
ensure adequate gas carrying capacity since an appli- 
ance has been added to the piping system (see A. 7. 1 for 
details). 



Barbecue 
40 cfh 



Section A 



Section B 



Section G 

Section C 



T 



Section F 



Section E 



X 



Section D 



Furnace 
80 cfh 



Water 
heater 
30 cfh 



Range/oven 
75 cfh 



Length of runs; 
A = 15ft E = 5ft 
B = 10ft F=10ft 
C = 15ft G = 15ft 
D = 20ft 



Key: 

X Shut-off valve 

[m| Gas meter 



FIGURE A.7.4 

PIPING PLAN SHOWING A MODIFICATION 

TO EXISTING PIPING SYSTEM 



FIGURE A.7.3 
PIPING PLAN SHOWING A COPPER TUBING SYSTEM 



134 



FUEL GAS CODE OF NEW YORK STATE 



ilZING 



RVING APPLI 
GORY I APPLf 

'ITH TYI 



(This appendix is informative and is not part of the code.) 



APPLDANCE VENTING TABU 

It Simgle drafft-tnoodl-eqelpped app 

An installer has a 120,000 British thermal unit (Btu) per hour 
input appliance with a 5 -inch-diameter draft hood outlet that 
needs to be vented into a 10-foot-high Type B vent system. 
What size vent should be used assuming (a) a 5-foot lateral sin- 
gle-wall metal vent connector is used with two 90-degree el- 
bows, or (b) a 5-foot lateral single-wall metal vent connector is 
used with three 90-degree elbows in the vent system? 



Table 504.2(2) should be used to solve this problem, because sin- 
gle-wall metal vent connectors are being used with a Type B vent. 

(a) Read down the first column in Table 504.2(2) until the 
row associated with a 10-foot height and 5-foot lateral 
is found. Read across this row until a vent capacity 
greater than 120,000 Btu per hour is located in the 
shaded columns labeled "NAT Max" for draft-hood- 



VENTCAP— C 



TYPE B DOUBLE-WALL— 
GAS VENT 



ffP. 



iJ) 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W 
Table 504.2(1) is used when sizing Type B double- wall gas vent connected 
directly to the appliance. 

NOTE: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 



SEB=1 

TYPE B DOUBLE-WALL VEiMT SYSTEM SERVING A S 
APPLIANCE W»TH A TYPE B DOUBLE-WALL VE 



(b) 



equipped appliances. In this case, a 5 -inch-diameter 
vent has a capacity of 122,000 Btu per hour and may be 
used for this application. 

If three 90-degree elbows are used in the vent system, 
then the maximum vent capacity listed in the tables 
must be reduced by 10 percent (see Section 504.2.3 for 
single appliance vents). This implies that the 5-inch-di- 
ameter vent has an adjusted capacity of only 1 10,000 
Btu per hour. In this case, the vent system must be in- 
creased to 6 inches in diameter (see calculations be- 
low). 

122,000 (.90) = 1 10,000 for 5-inch vent 
From Table 504.2(2), Select 6-inch vent 
186,000 (.90) = 167,000; This is greater than the re- 
quired 120,000. Therefore, use a 6-inch vent and con- 
nector where three elbows are used. 



TYPE B DOUBLE-WALL- 
GAS VENT 



SINGLE-WALL VENT- 
CONNECTOR 




For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 IW 
Table 504.2(2) is used when sizing a single-wall metal vent connector 
attached to a Type B double-wall gas vent. 

NOTE: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-2 

TYPE B DOOBLE-WALL VENT SYSTEM SERVING 

A SINGLE APPLIANCE WITH A SINGLE-WALL 

WJETAL VENT CONNECTOR 



FUEL GAS CODE OF NEW YORK STATE 



135 



APPENDIX B 















TILE-LINED MASONRY ~ 

CHIMNEY 




H 


r 








1 


1 




q 








( \ 


B DOUBLE-WALL— 
VENT USED AS 
VJECTOR 




D 


.__. 




l^ 1 








- 


A 

1 


- 



^ 



~\^ — VENT CAP 



V 




Table 504.2(3) is used when sizing a Type B double-wall gas vent connector 
attached to a tile-lined masonry chimney. 

NOTE: "A" is the equivalent cross-sectional area of the tile liner. 

NOTE: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-3 

VENT SYSTEM SERVING A SINGLE APPLIANCE 

WITH A MASONRY CHIMNEY OF TYPE B 

DOUBLE-WALL VENT CONNECTOR 



Asbestos cement Type B or single-wall metal vent serving a single draft- 
hood-equipped appliance [see Table 504.2(5)]. 

FIGURE B-5 

ASBESTOS CEMENT TYPE B OR SINGLE-WALL 

METAL VENT SYSTEM SERVING A SINGLE 

DRAFT-HOOD-EQUJPPED APPLIANCE 



}<»- VENT CAP 



TILE-LINED MASONRY - 
CHIMNEY 




SINGLE-WALL VENT- 
CONNECTOR 




TYPE B DOUBLE-WALL 
GAS VENT USED AS 
CONNECTORS 



Table 504.2(4) is used when sizing a single-wall vent connector attached to 
a tile-lined masonry chimney. 

NOTE: "A" is the equivalent cross-sectional area of the tile liner. 

NOTE: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-4 

VENT SYSTEM SERVING A SINGLE APPLIANCE 

USING A MASONRY CHIMNEY AND A 

SINGLE-WALL METAL VENT CONNECTOR 



Table 504.3(1) is used when sizing Type B double-wall vent connectors at- 
tached to a Type B double- wall common vent. 

NOTE: Each appliance may be either Category I draft hood equipped or 
fan-assisted type. 

FIGURE B-6 

VENT SYSTEM SERVING TWO OR MORE APPLIANCES 

WITH TYPE B DOUBLE-WALL VENT AND TYPE B 

DOUBLE-WALL VENT CONNECTOR 



136 



FUEL GAS CODE OF NEW YORK STATE 



APPENDBX B 



h VENT CAP 




Table 504.3(2) is used when sizing single-wall vent connectors attached to a 
Type B double-wall common vent. 

NOTE: Each appliance may be either Category I draft hood equipped or 
fan-assisted type. 



VENT SYSTEM SERVING TWO OR MORE APPLIANCES 

WSTH TYPE B DOUBLE-WALL VENT AND 

SBNGLE-WALL METAL VENT CONNECTORS 



TILE-LINED MASONRY 
CHIMNEY 




Table 504.3(4) is used when sizing single-wall metal vent connectors at- 
tached to a tile-lined masonry chimney. 

NOTE: "A" is the equivalent cross-sectional area of the tile liner. 

NOTE: Each appliance may be either Category I draft hood equipped or 
fan-assisted type. 

FIGURE B-9 

MASONRY CHBMNEY SERVING TWO OR MORE APPLIANCES 

WITH SINGLE-WALL METAL VENT CONNECTORS 



TYPE B DOUBLE-WALL 
H GAS VENT USED AS 
CONNECTORS 



-TILE-LINED MASONRY 
CHIMNEY 




Table 504.3(3) is used when sizing Type B double-wall vent connectors at- 
tached to a tile-lined masonry chimney. 

NOTE: "A" is the equivalent cross-sectional area of the tile liner. 

NOTE: Each appliance may be either Category I draft hood equipped or 
fan-assisted type. 



I . , , H ^VENT CAP 




1AS0NRY CHIMNEY SERVING TWO OR MORE APPLIANCES 
WITH TYPE B DOUBLE-WALL VENT CONNECTOR 



Asbestos cement Type B or single- wall metal pipe vent serving two or more 
draft-hood-equipped appliances [see Table 504.3(5)]. 

FllGUREB-10 

ASBESTOS CEMENT TYPE B OR SINGLE-WALL 

METAL VENT SYSTEM SERVING TWO OR MORE 

DRAFT-HOOD-EQUIPPED APPLIANCES 



FUEL GAS CODE OF NEW YORK STATE 



137 



APPENDIX B 




VENT CONNECTOR 




■COMMON VENT SIZE BASED — 
ON ALL INPUTS ENTERING THIS 
SEGMENT, AND AVAILABLE 
TOTAL HEIGHT 



•TOTAL INPUT 



•AVAILABLE TOTAL HEIGHT 
■H" EQUALS RISE PLUS 
DISTANCE BETWEEN TEES 




Example: Manifolded Common Vent Connector L„ shall be no greater than 
18 times the common vent connector manifold inside diameter; i.e., a 4- 
inch (102 mm) inside diameter common vent connector manifold shall not 
exceed 72 inches (1829 mm) in length (see Section 504.3.4). 

NOTE: This is an illustration of a typical manifolded vent connector. Dif- 
ferent appliance, vent connector, or common vent types are possible. Con- 
sult Section 502.3. 

FIGURE B-11 
USE OF MANIFOLD COMMON VENT CONNECTOR 



V777777777777777? 



Vent connector size depends on: 
@ Input 
® Rise 

® Available total height "/f' 
® Table 504.3(1) connectors 



Common vent size depends on: 

* Combined inputs 

• Available total height "//" 

® Table 504. 3( 1 ) common vent 



FIGURE B-13 

lULTISTORY GAS VENT DESIGN PROCEDURE 

FOR EACH SEGMENT OF SYSTEM 



h^VENT CAP 




Example: Offset Common Vent 

NOTE: This is an illustration of a typical offset vent. Different appliance, 
vent connector, or vent types are possible. Consult Sections 504.2 and 
504.3. 

FIGURE B-12 
USE OF OFFSET COMMON VENT 



USE INDIVIDUAL 
VENT FOR TOP FLOOR 
APPLIANCE IF 
CONNECTOR 
REQUIREMENT FOR 
RISE OF TOTAL HEIGHfT 
CANNOT BE MET 



AVAILABLE TOTAL 
HEIGHT FOR TOP 
aOOR APPLIANCE 



s. 



USE AVAILABLE TOTAL HEIGHT FOR 
TOP aOOR APPLIANCE AND 
COMBINE INPUT OF ALL APF1.IANCES 
ON COMMON VENT 



fl— 



AVAimBLE TOTAL 
HEIGHT FOR 
THIRD-aOOR 
APPLIANCE 



s. 



THIRD INTERCONNECTION TEE' 

- AVAILABLE TOTAL HEIGHT FOR 
TXIRDFLOOR APPLIANCE AND 
COMBINED INPUT OF THREE 
APPLIANCES (IF TOP ROOR 
APPLIANCE IS NOT CONNECTED, 
MEASURED TOTAL HEIGHT TO 
VENT TOP) 



<a— ^ 



AVAILABLE TOTAL 
HEIGHT FOR 
SECOND-aOOR 
APaiANCE 



s. 



iTi 



SECOND INTERCONNECTION TEE' 



-USE AVAILABLE TOTAL HEIGHT FOR 
SECOND-aOOR APPUANCE AND 
COMBINED HEAT INPUT OF TWO 
APPLIANCES 

FIRST INTERCONNECTION TEE- 



DESIGN VENT CONNECTOR FOR FIRST 
aOOR APMANCE AS AN INDIVIDUAL 
VENT OFTHIS TOTAL HEIGHT FOR INPITT 
OF FIRST aoOR APaiANCE 



s. 



-TEE WITH CAP OPTIONAL 



Principles of design of multistory vents using vent connector and common 
vent design tables (see Sections 504.3.11 through 504.3.17). 

FIGURE B-14 
MULTISTORY VENT SYSTEMS 



138 



FUEL GAS CODE OF NEW YORK STATE 



TYPE B DOUBLE-WALL- 
GAS VENT 



10fl 




DRAFT HOOD EQUIPPED APPLIANCE 
120,000 BTU/H INPUT 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 

8EB-1 5 (EXAMPLES) 



TYPE-B DOUBLE-WALL- 
GAS VENT 




an 



E 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 

FIGURE B-16 (EXAMPLE 2) 
SINGLE FAN-ASSISTED APPLIANCE 



Example 2; Siirigle fae=as§nstedl appllamce 

An installer has an 80,000 Btu per hour input fan-assisted ap- 
pliance that must be installed using 10 feet of lateral connector 
attached to a 30-foot-high Type B vent. Two 90-degree elbows 
are needed for the installation. Can a single-wall metal vent 
connector be used for this application? 

Soletloms 

Table 504.2(2) refers to the use of single-wall metal vent con- 
nectors with Type B vent. In the first column find the row asso- 
ciated with a 30-foot height and a 10-foot lateral. Read across 
this row, looking at the FAN Min and FAN Max columns, to 
find that a 3-inch-diameter single- wall metal vent connector is 
not recommended. Moving to the next larger size single wall 
connector (4 inches), note that a 4-inch-diameter single- wall 
metal connector has a recommended minimum vent capacity of 
91,000 Btu per hour and a recommended maximum vent ca- 
pacity of 144,000 Btu per hour. The 80,000 Btu per hour fan- 
assisted appliance is outside this range, so the conclusion is that 
a single-wall metal vent connector cannot be used to vent this 
appliance using 10 feet of lateral for the connector. 

However, if the 80,000 Btu per hour input appliance could be 
moved to within 5 feet of the vertical vent, then a 4-inch single- 
wall metal connector could be used to vent the appliance. Table 
504.2(2) shows the acceptable range of vent capacities for a 4- 
inch vent with 5 feet of lateral to be between 72,000 Btu per 
hour and 157,000 Btu per hour. 

If the appliance cannot be moved closer to the vertical vent, 
then Type B vent could be used as the connector material. In 
this case. Table 504.2(1) shows that for a 30-foot-high vent 
with 10 feet of lateral, the acceptable range of vent capacities 
for a 4-inch-diameter vent attached to a fan-assisted appliance 
is between 37,000 Btu per hour and 150,000 Btu per hour. 



An installer has an 80,000 Btu per hour input appliance with a 
4-inch-diameter draft hood outlet that needs to be vented into a 
12-foot- high Type B vent. The vent connector has a 5 -foot lat- 
eral length and is also Type B. Can this appliance be vented us- 
ing a 4-inch-diameter vent? 



Table 504.2(1) is used in the case of an all Type B vent system. 
However, since there is no entry in Table 504.2(1) for a height 
of 12 feet, interpolation must be used. Read down the 4-inch di- 
ameter NAT Max column to the row associated with 10-foot 
height and 5-foot lateral to find the capacity value of 77,000 
Btu per hour. Read further down to the 15-foot height, 5-foot 
lateral row to find the capacity value of 87,000 Btu per hour. 
The difference between the 15-foot height capacity value and 
the 10-foot height capacity value is 10,000 Btu per hour. The 
capacity for a vent system with a 12-foot height is equal to the 
capacity for a 10-foot height plus V^ of the difference between 
the 10-foot and 15-foot height values, or 77,000 + 2/5 (10,000) = 
81,000 Btu per hour. Therefore, a 4-inch-diameter vent may be 
used in the installation. 

EXAMPLES USING COMMON VENTING TABLES 

Example 4: Common ventiog two draft-hood-equlpped ap= 



A 35,000 Btu per hour water heater is to be common vented 
with a 150,000 Btu per hour furnace using a common vent with 
a total height of 30 feet. The connector rise is 2 feet for the wa- 
ter heater with a horizontal length of 4 feet. The connector rise 
for the furnace is 3 feet with a horizontal length of 8 feet. As- 
sume single-wall metal connectors will be used with Type B 
vent. What size connectors and combined vent should be used 
in this installation? 



FUEL GAS CODE OF NEW YORK STATE 



139 



APPENDIX B 



COMBINED CAPACITY 

35,000 + 1 50,CXX) = 1 85,000 BTU/H 




DRAR HOOD-EQUIPPED 
WATER HEATER 
35,000 BTU/H INPUT 



DRAR HOOD-EQUIPMENT 

■ FURNACE 

150,000 BTU/H INPUT 



FIGURE B-17 (EXAMPLE 4) 
COMMON VENTING TWO DRAFT- 
HOOD-EQUIPPED APPLIANCES 



Solution: 

Table 504.3(2) should be used to size single-wall metal vent 
connectors attached to Type B vertical vents. In the vent con- 
nector capacity portion of Table 504.3(2), find the row associ- 
ated with a 30-foot vent height. For a 2-foot rise on the vent 
connector for the water heater, read the shaded columns for 
draft-hood-equipped appliances to find that a 3-inch-diameter 
vent connector has a capacity of 37,000 Btu per hour. There- 
fore, a 3-inch single-wall metal vent connector may be used 
with the water heater. For a draft-hood-equipped furnace with a 
3-foot rise, read across the appropriate row to find that a 5-inch- 
diameter vent connector has a maximum capacity of 120,000 
Btu per hour (which is too small for the furnace) and a 6-inch- 
diameter vent connector has a maximum vent capacity of 
172,000 Btu per hour. Therefore, a 6-inch-diameter vent con- 
nector should be used with the 150,000 Btu per hour furnace. 
Since both vent connector horizontal lengths are less than the 
maximum lengths listed in Secfion 504.3.2, the table values 
may be used without adjustments. 

In the common vent capacity portion of Table 504.3(2), find 
the row associated with a 30-foot vent height and read over to 
the NAT + NAT portion of the 6-inch-diameter column to find a 
maximum combined capacity of 257,000 Btu per hour. Since 
the two appliances total only 185,000 Btu per hour, a 6-inch 
common vent may be used. 



Example 5a: Commomi venting a draft-hood-equipped wa- 
ter heater with a fan-assisted furnace into a Type B vent 

In this case, a 35,000 Btu per hour input draft-hood- 
equipped water heater with a 4-inch-diameter draft hood outlet, 
2 feet of connector rise, and 4 feet of horizontal length is to be 
common vented with a 100,000 Btu per hour fan-assisted fur- 
nace with a 4-inch-diameter flue collar, 3 feet of connector rise, 
and 6 feet of horizontal length. The common vent consists of a 
30-foot height of Type B vent. What are the recommended vent 
diameters for each connector and the common vent? The in- 
staller would like to use a single-wall metal vent connector. 

Solution: - [Table 504.3(2)] 

Water Heater Vent Connector Diameter. Since the water heater 
vent connector horizontal length of 4 feet is less than the maxi- 
mum value listed in Section 504.3.2, the venting table values 
may be used without adjustments. Using the Vent Connector 
Capacity portion of Table 504.3(2), read down the Total Vent 
Height (H) column to 30 feet and read across the 2-foot Con- 
nector Rise (R) row to the first Btu per hour rating in the NAT 
Max column that is equal to or greater than the water heater in- 
put rating. The table shows that a 3-inch vent connector has a 
maximum input radng of 37,000 Btu per hour. Although this is 
greater than the water heater input rating, a 3-inch vent connec- 
tor is prohibited by Section 504.3.21. A 4-inch vent connector 
has a maximum input rating of 67,000 Btu per hour and is equal 
to the draft hood outlet diameter. A 4-inch vent connector is se- 
lected. Since the water heater is equipped with a draft hood, 
there are no minimum input rating restrictions. 

Furnace Vent Connector Diameter. Using the Vent Connec- 
tor Capacity portion of Table 504.3(2), read down the Total 
Vent Height (H) column to 30 feet and across the 3-foot Con- 
nector Rise (R) row. Since the furnace has a fan-assisted com- 
bustion system, find the first FAN Max column with a Btu per 
hour rating greater than the furnace input rating. The 4-inch 
vent connector has a maximum input rating of 11 9,000 Btu per 
hour and a minimum input rating of 85,000 Btu per hour. The 
100,000 Btu per hour furnace in this example falls within this 
range, so a 4-inch connector is adequate. Since the furnace vent 
connector horizontal length of 6 feet does not exceed the maxi- 
mum value listed in Section 504.3.2, the venting table values 
may be used without adjustment. If the furnace had an input rat- 
ing of 80,000 Btu per hour, then a Type B vent connector [see 
Table 504.3( 1)] would be needed in order to meet the minimum 
capacity limit. 

Common Vent Diameter. The total input to the common vent 
is 1 35,000 Btu per hour. Using the Common Vent Capacity por- 
fion of Table 504.3(2), read down the Total Vent Height (H) 
column to 30 feet and across this row to find the smallest vent 
diameter in the FAN -i- NAT column that has a Btu per hour rat- 
ing equal to or greater than 135,000 Btu per hour. The 4-inch 
common vent has a capacity of 1 32,000 Btu per hour and the 5- 
inch common vent has a capacity of 202,000 Btu per hour. 
Therefore, the 5-inch common vent should be used in this ex- 
ample. 



140 



FUEL GAS CODE OF NEW YORK STATE 



APPENDIX B 



c 



TYPE B DOUBLE-WALL - 
GASVENO" 



COMBINED CAPACITY 

35,000 + 1 00,000 = 1 35,000 BTU/H 



<--\ 




COMiVlON VENTBff 
FURNACE 



E B=1 8 (EXAMPLE 5A) 
DRAFT HOOD WITH A 
E B DOUBLE-WALL CO 



■ASSISTED 
ION VENT 



Summary. In this example, the installer may use a 4-inch-di- 
ameter, single-wall metal vent connector for the water heater 
and a 4-inch-diameter, single- wall metal vent connector for the 
furnace. The common vent should be a 5 -inch-diameter Type B 
vent. 

Example Stos Commoe vemtamg ieto a masonry chimney 

In this case, the water heater and fan-assisted furnace of Exam- 
ple 5 a are to be common vented into a clay tile-lined masonry 
chimney with a 30-foot height. The chimney is not exposed to 
the outdoors below the roof line. The internal dimensions of the 
clay tile liner are nominally 8 inches by 12 inches. Assuming 
the same vent connector heights, laterals, and materials found 
in Example 5a, what are the recommended vent connector di- 
ameters, and is this an acceptable installation? 



Table 504.3(4) is used to size common venting installations in- 
volving single-wall connectors into masonry chimneys. 

Water Heater Vent Connector Diameter. Using Table 
504.3(4), Vent Connector Capacity, read down the Total Vent 
Height {H) column to 30 feet, and read across the 2-foot Con- 
nector Rise (/?) row to the first Btu per hour rating in the NAT 
Max column that is equal to or greater than the water heater in- 
put rating. The table shows that a 3 -inch vent connector has a 
maximum input of only 31,000 Btu per hour while a 4-inch 
vent connector has a maximum input of 57,000 Btu per hour. A 
4-inch vent connector must therefore be used. 

Furnace Vent Connector Diameter. Using the Vent Connec- 
tor Capacity portion of Table 504.3(4), read down the Total 



Vent Height (H) column to 30 feet and across the 3-foot 
Connector Rise (R) row. Since the furnace has a fan-assisted 
combustion system, fmd the first FAN Max column with a Btu 
per hour rating greater than the furnace input rating. The 4-inch 
vent connector has a maximum input rating of 127,000 Btu per 
hour and a minimum input rating of 95,000 Btu per hour. The 
100,000 Btu per hour furnace in this example falls within this 
range, so a 4-inch connector is adequate. 

Masonry Chimney. From Table B- 1 , the equivalent area for a 
nominal liner size of 8 inches by 12 inches is 63.6 square 
inches. Using Table 504.3(4), Common Vent Capacity, read 
down the FAN + NAT column under the Minimum Internal 
Area of Chimney value of 63 to the row for 30-foot height to 
fmd a capacity value of 739,000 Btu per hour. The combined 
input rating of the furnace and water heater, 135,000 Btu per 
hour, is less than the table value, so this is an acceptable instal- 
lation. 

Section 504.3.17 requires the common vent area to be no 
greater than seven times the smallest listed appliance catego- 
rized vent area, flue collar area, or draft hood outlet area. Both 
appliances in this installation have 4-inch-diameter outlets. 
From Table B- 1 , the equivalent area for an inside diameter of 4 
inches is 12.2 square inches. Seven times 12.2 equals 85.4, 
which is greater than 63.6, so this configuration is acceptable. 

Example 5c: Common venting into an exterior masonry 



In this case, the water heater and fan-assisted furnace of Exam- 
ples 5 a and 5b are to be common vented into an exterior ma- 
sonry chimney. The chimney height, clay tile liner dimensions, 
and vent connector heights and laterals are the same as in Ex- 
ample 5b. This system is being installed in Charlotte, North 
Carolina. Does this exterior masonry chimney need to be re- 
lined? If so, what corrugated metallic liner size is recom- 
mended? What vent connector diameters are recommended? 



According to Section 504.3.20, Type B vent connectors are re- 
quired to be used with exterior masonry chimneys. Use Table 
504.3(8) to size FAN+NAT common venting installations in- 
volving Type-B double wall connectors into exterior masonry 
chimneys. 

The local 99-percent winter design temperature needed to 
use Table 504.3(8) can be found in the ASHRAE Handbook of 
Fundamentals. For Charlotte, North Carolina, this design tem- 
perature is 19°F. 

Chimney Liner Requirement. As in Example 5b, use the 63 
square inch Internal Area columns for this size clay tile liner. 
Read down the 63 square inch column of Table 504. 3 (8a) to the 
30-foot height row to find that the combined appliance maxi- 
mum input is 747,000 Btu per hour. The combined input rating 
of the appliances in this installation, 135,000 Btu per hour, is 
less than the maximum value, so this criterion is satisfied. Table 
504.3(8b), at a 19°F design temperature, and at the same vent 
height and internal area used above, shows that the minimum 
allowable input rating of a space-heating appliance is 470,000 
Btu per hour. The furnace input rating of 100,000 Btu per hour 
is less than this minimum value. So this criterion is not satis- 
fied, and an alternative venting design needs to be used, such as 



FUEL GAS CODE OF NEW YORK STATE 



APPENDIX B 



a Type B vent shown in Example 5a or a listed chimney liner 
system shown in the remainder of the example. 

According to Section 504.3. 19, Table 504.3(1) or 504.3(2) is 
used for sizing corrugated metallic liners in masonry chim- 
neys, with the maximum common vent capacities reduced by 
20 percent. This example will be continued assuming Type B 
vent connectors. 

Water Heater Vent Connector Diameter. Using Table 
504.3(1), Vent Connector Capacity, read down the Total Vent 
Height (H) column to 30 feet, and read across the 2-foot Con- 
nector Rise (/?) row to the first Btu/h rating in the NAT Max col- 
umn that is equal to or greater than the water heater input rating. 
The table shows that a 3-inch vent connector has a maximum 
capacity of 39,000 Btu/h. Although this rating is greater than 
the water heater input rating, a 3-inch vent connector is prohib- 
ited by Section 504.3.21. A 4-inch vent connector has a maxi- 
mum input rating of 70,000 Btu/h and is equal to the draft hood 
outlet diameter. A 4-inch vent connector is selected. 

Furnace Vent Connector Diameter. Using Table 504.3(1), 
Vent Connector Capacity, read down the Vent Height (//) col- 
umn to 30 feet, and read across the 3-foot Connector Rise (/?) 
row to the first Btu per hour rating in the FAN Max column that 
is equal to or greater than the furnace input rating. The 100,000 
Btu per hour furnace in this example falls within this range, so a 
4-inch connector is adequate. 

Chimney Liner Diameter. The total input to the common 
vent is 135,000 Btu per hour. Using the Common Vent Capac- 
ity Portion of Table 504.3(1), read down the Vent Height (H) 
column to 30 feet and across this row to find the smallest vent 
diameter in the FAN-i-NAT column that has a Btu per hour rat- 
ing greater than 135,000 Btu per hour. The 4-inch common 
vent has a capacity of 1 38,000 Btu per hour. Reducing the max- 
imum capacity by 20 percent (Section 504.3.17) results in a 
maximum capacity for a 4-inch corrugated hner of 110,000 
Btu per hour, less than the total input of 135,000 Btu per hour. 
So a larger liner is needed. The 5-inch common vent capacity 
listed in Table 504.3(1) is 210,000 Btu per hour, and after re- 
ducing by 20 percent is 168,000 Btu per hour. Therefore, a 5- 
inch corrugated metal liner should be used in this example. 

Single- Wall Connectors. Once it has been established that 
relining the chimney is necessary. Type B double-wall vent 
connectors are not specifically required. This example could be 
redone using Table 504.3(2) for single-wall vent connectors. 
For this case, the vent connector and liner diameters would be 
the same as found above with Type B double-wall connectors. 



TABLE B-1 

1AS0NRY CHIMNEY LINER DIMENSIONS 

WITH CIRCULAR EQUIVALENTS^ 



NOMINAL 

LINER SIZE 

(inches) 


INSIDE 

DIMENSIONS 

OF LINER 

(inches) 


INSIDE 

DIAMETER OR 

EQUIVALENT 

DIAMETER 

(inches) 


EQUIVALENT 

AREA 

(square inches) 


4x8 


2V2 X 6'/2 


4 


12.2 


5 


19.6 


6 


28.3 


7 


38.3 


8x8 


6^/4 X 6V4 


7.4 


42.7 


8 


50.3 


8x12 


6'/2XlOV2 


9 


63.6 


10 


78.5 


12x12 


9% X 93/4 


10.4 


83.3 


11 


95 


12 X 16 


91/2 X I3V2 


11.8 


107.5 


12 


113.0 


14 


153.9 


16x16 


1374x1374 


14.5 


162.9 


15 


176.7 


16x20 


13x17 


16.2 


206.1 


18 


254.4 


20x20 


16% X 16% 


18.2 


260.2 


20 


314.1 


20x24 


1672 X 2072 


20.1 


314.2 


22 


380.1 


24x24 


2074 X 2074 


22.1 


380.1 


24 


452.3 


24x28 


2074 X 2074 


24.1 


456.2 


28x28 


2474 X 2474 


26.4 


543.3 


27 


572.5 


30x30 


2572 X 2572 


27.9 


607 


30 


706.8 


30x36 


2572x3172 


30.9 


749.9 


33 


855.3 


36x36 


3172x3172 


34.4 


929.4 


36 


1017.9 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 m^. 

a. Where liner sizes differ dimensionally from those shown in Table B-1, 
equivalent diameters may be determined from published tables for 
square and rectangular ducts of equivalent carrying capacity or by other 
engineering methods. 



142 



FUEL GAS CODE OF NEW YORK STATE 



w 



-10T 
(-23° C) 




37° F 
(3°C) 



37T 
(3°C) 



EB-19 



X 



1 44 FUEL GAS CODE OF NEW YORK STATE 



AFPENBiX C (IFGS) 



FUEL GAS CODE OF MEW YORK STATE 



US 



1 46 FUEL GAS CODE OF NEW YORK STATE 



iF Al 



■XISTING APPLIANCE INSTALLATION 



(This appendix is informative and is not part of the code.) 



The following procedure is intended as a guide to aid in deter- 
mining that an appliance is properly installed and is in a safe 
condition for continuing use. 

This procedure is predicated on central furnace and boiler in- 
stallations, and it should be recognized that generalized proce- 
dures cannot anticipate all situations. Accordingly, in some 
cases, deviation from this procedure is necessary to determine 
safe operation of the equipment. 

(a) This procedure should be performed prior to any at- 
tempt at modification of the appliance or of the installa- 
tion. 

(b) If it is determined there is a condition that could result 
in unsafe operation, the appliance should be shut off 
and the owner advised of the unsafe condition. The fol- 
lowing steps should be followed in making the safety 
inspection: 

1. Conduct a test for gas leakage. (See Section 
406.6) 

2. Visually inspect the venting system for proper 
size and horizontal pitch and determine there is 
no blockage or restriction, leakage, corrosion, 
and other deficiencies that could cause an unsafe 
condition. 

3. Shut off all gas to the appliance and shut off any 
other fuel-gas-burning appliance within the same 
room. Use the slhratofff valve nmi the sepply Inme 
to each appliannce. 

4. Inspect burners and crossovers for blockage and 
corrosion. 



i§. Inspect the heat 
exchanger for cracks, openings, or excessive cor- 
rosion. 



lie omly to bonlerSo Inspect for evidence 
of water or combustion product leaks. 

Insofar as is practical, close all building doors 
and windows and all doors between the space in 
which the appliance is located and other spaces of 
the building. Turn on clothes dryers. Turn on any 
exhaust fans, such as range hoods and bathroom 
exhausts, so they will operate at maximum speed. 
Do not operate a summer exhaust fan. Close fire- 
place dampers. If, after completing Steps 8 
through 13, it is beUeved sufficient combustion 
air is not available, refer to Section 304 of this 
code for guidance. 



8. Place the appliance being inspected in operation. 

Follow the lightneg nnstractiomis. Adjust the 
thermostat so appliance will operate continu- 
ously. 

9. Determine that the pilot(s), where provided, is 
burning properly and that the main burner igni- 
tion is satisfactory by interrupting and reestab- 
lishing the electrical supply to the appliance in 
any convenient manner. If the appliance is 
equipped with a continuous pilot(s), test the pilot 
safety device(s) to determine if it is operating 
properly by extinguishing the pilot(s) when the 
main bumer(s) is off and determining, after 3 
minutes, that the main burner gas does not flow 
upon a call for heat. If the appliance is not pro- 
vided with a pilot(s), test for proper operation of 
the ignition system in accordance with the appli- 
ance manufacturer's lighting and operating in- 
structions. 

10. Visually determine that the main burner gas is 
burning properly (i.e., no floating, lifting, or 
flashback). Adjust the primary air shutter(s) as 
required. If the appliance is equipped with high 
and low flame controlling or flame modulation, 
check for proper main burner operation at low 
flame. 



Test for spillage at the draft hood relief opening 
after 5 minutes of main burner operation. Use a 
flame of a match or candle or smoke. 

Turn on all other fuel-gas-buming appliances 
within the same room so they will operate at their 
full inputs. Follow Mghtimg lestrections for 



11. 



12. 



1 3 . Repeat Steps 1 and 11 on the appliance being in- 
spected. 

14. Return doors, windows, exhaust fans, fireplace 
dampers, and any other fuel-gas-burning appli- 
ance to their previous conditions of use. 

15. Applkable only to fernaces.. Check both the 
limit control and the fan control for proper opera- 
tion. Limit control operation can be checked by 
blocking the circulating air inlet or temporarily 
disconnecting the electrical supply to the blower 
motor and determining that the limit control acts 
to shut off the main burner gas. 



FUEL GAS CODE OF tMEW YORK STATE 



M7 



APPENDIX D 



16. Applicable only to boilers. Determine that the 
water pumps are in operating condition. Test low 
water cutoffs, automatic feed controls, pressure 
and temperature limit controls, and relief valves 
in accordance with the manufacturer's recom- 
mendations to determine that they are in operat- 
ing condition. 



FUEL GAS CODE OF NEW YORK STATE 



AFPEi^DDX E (IFd 



^ 



^ 



N\\ 




Bearing studs bored 
to 60% of stud width 



rvi 



Not more than 
two successive 
double studs 
permitted 



:^ 



Boring of bearing studs 
to 60% of width 




%" min 



40% of 
stud wall 



Stud wall 




■ stud width 




Notching exterior and 
bearing walls 



Notching nonbearing walls 



FUEL GAS CODE OF MEW YORK STATE 



149 



APPENDIX E 



D/3 maximum 



2" minimum 
from top 
and bottom 
of joist 




Pipe or 
conduit 



BORED HOLES M JOSSTS 



D/4 maximum - 
at ends 




D/4 maximum 
at ends 



NOTCHES AT ENDS OF JOISTS 




D/6 maximum 



150 



FUEL GAS CODE OF NEW YORK STATE 



ACCESS, APPLDAWCES 

Duct furnaces 610.3 

General 306 

Shutoff valves 409.1 .3, 409.3.1 , 409.5 

Wall furnaces, vented 608.6 

ADJUSTMENTS 608.6, 621 .6 

ADIilMISTRATiON Chapter 1 

Alternate materials and methods 105.2 

Alternate methods of sizing chimneys. . . . 503.5.5 

Appeals 1 09 

Certificates 1 04.8 

Duties and powers of code official 1 04 

Fees 106.4, 106.5 

Inspections 104.4, 104.8, 107 

Liability 103.4 

Permits 106 

Plan review 106.5.3(3) 

Severability 101 .5 

Scope 101.2 

Title 101.1 

Violations and penalties 108 

AIR, COliBUSTION 

Defined 202 

Requirements 303.3(1), 304 

AIR=CONDmONING EQUIPiiEWT 627 

Clearances 308.3 



lATE MATERIALS Af 



105.2 



Broilers for indoor use 623.5 

Connections to building piping 41 1 

Cooking 623 

Decorative 602 

Decorative vented 202, 303.3(2), 

Table 503.4, 604 

Domestic ranges 623.4 

Electrical 309 

Installation Chapter 6 

Prohibited locations 303.3 

Protection from damage 303.4 



e 



,405 



Existing installations Appendix D 



Listed 631 

Prohibited locations 303.3 

Unlisted 632 

yiNGS 403.10.4(5), 404.3 



CENTRAL FURNACES 

Defined 202 

Existing installation Appendix D 

^ERTiFflCATES 104.8 

^HliiMEYS Chapter 5 

Alternate methods of sizing 503.5.5 

Clearance reduction 308 

Damper opening area 634 

Defined 202 

XEARANCE REDUCTION 308 

CLEARANCES 

Air-conditioning equipment 627.4 

Boilers 308.4 

Domestic ranges 623.4 

Floor furnaces 609.4, 609.6 

Open-top broiler units 623.5.1 

Refrigerators 625.1 

Unit heater 620.4 

CLOTHES DRYERS 

Defined 202 

Exhaust 614 

General 613 

CODE OFFICIAL 

Defined 202 

Duties and powers 1 04 

^OBiBUSTION AIR 

Combination indoor and outdoor 304.7 

Defined 202 

Exhaust effect 304.4 

Free area 304.5.3.1, 304.5.3.2, 304.6.1, 

304.6.2,304.10 

Horizontal ducts 304.6.1 

Indoor 304.5 

Outdoor 304.6 

Sources of (from) 304.1 1 (4) 

Sauna heaters 615.5 

Vertical ducts 304.6.1 

;01MiPRESSED NATURAL GAS 413 

CONCEALED PIPING 404.2 

CONDENSATE DISPOSAL 307 



JEL GAS CODE OF NEW YORK STATE 



151 



INDEX 



CONTROLS 

Boilers 631.2 

Gas pressure regulators 410.1, 628.4 

CONVERSION BURNERS 503.12.1, 619 

COOKING APPLIANCES 623 

CORROSION PROTECTION 404.8 

CREMATORIES 606 

CUTTING, NOTCHING AND 
BORED HOLES 302.3 

D 

DAMPERS, VENT 503.14 

DECORATIVE APPLIANCES 602 

DEFINITIONS Chapter 2 

DIRECT VENT APPLIANCES 

Defined 202 

Installation 304.1 

DITCH FOR PIPING 107.1(1) 

DIVERSITY FACTOR 402.2, Appendix A 

DRAFT HOODS 202, 503.12 

DUCT FURNACES 202, 610 

E 

ELECTRICAL CONNECTIONS 309.2 

EXHAUST SYSTEMS 202, 503.2.1 , 503.3.4 

F 

FEES 104.8, 106.4, 106.5 

FLOOD HAZARD 301 .1 1 

FLOOR FURNACES 609 

FURNACES 

Central heating, clearance 308.3, 308.4 

Duct 610 

Floor 609 

Prohibited location 303.3 

Vented wall 608 

G 

GARAGE, INSTALLATION 305.3, 305.4, 305.5 

GASEOUS HYDROGEN SYSTEMS Chapter 7 

General requirements 703 

Piping, use and handling 704 

Testing 705 

GROUNDING, PIPE 309.1 

H 

HISTORIC BUILDINGS 102.6 

HOT PLATES AND LAUNDRY 

STOVES 501 .8(3), 623.1 

f 
ILLUMINATING APPLIANCES 628 

152 



INCINERATORS 606, 607 

INFRARED RADIANT HEATERS 630 

INSPECTIONS 104.4, 104.8, 107 

INSTALLATION, APPLIANCES 

Garage 305 

Listed and unlisted appliances 301 .3, 305.1 

General 301 

Specific appliances Chapter 6 

s%. 

KILNS 629 

L 

LIQUEFIED PETROLEUM GAS 

Defined 202 

Motor vehicle fuel-dispensing stations 412 

Storage 401 .2 

Systems 402.5.1 

Piping material 403.6.2, 403.1 1 (4) 

Thread compounds 403.9.3 

Size of pipe or tubing Appendix A 

LOG LIGHTERS 603 

M 

MAKE-UP AIR HEATERS 611,612 

Industrial 612 

Venting 501.8(9) 

MATERIALS, DEFECTIVE 

Repair 301.9 

Workmanship and defects 403.7 

METERS 

Interconnections 401 .6 

Identification 401 .7 

Multiple installations 401 .6 

MINIMUM SAFE PERFORMANCE, 
VENT SYSTEMS 503.3 

o 

OUTLET CLOSURES 404.12 

Location 404.13 

OXYGEN DEPLETION SYSTEM 

Defined 202 

Unvented room heaters 303.3(3), 621.6 

P 

PIPE SIZING 402 

PIPING 

Bends 405 

Changes in direction 405 

Drips and slopes 408 

Installation 404 

FUEL GAS CODE OF NEW YORK STATE 



Inspection 406 

Materials 403 

Purging 406.7 

Sizing 402 

Support 407, 41 5 

Testing 406 

1 HEATERS 617 

104 

Floor furnaces 609.2 

Fuel-burning appliances 303.3 

Piping in partitions 404.2 

Plastic piping 404.14.1 

Unvented room heater 621 .4 

Vent connectors 503.3.3(4) 

GliSiG 406.7 

R 

mUT HEATERS 630 

GES, DOI/SESTIC 623.4 

RiGERATORS 501 .8(6), 625 

ULATORS, PRESSURE 410.1,628.4 

>FTOP iiSiSTALLATIONS 306.5 

m HEATERS 

Defined 202 

Location 303.3 

Unvented 621 

Vented 622 

ETY SHUTOFF DEVICES 

Flame safeguard device 602.2 

Unvented room heaters 620.6 

NA HEATERS 615 

PE 101.2 

MIC RESISTANCE 301.12 

^iCE SPACE 306 

HEATERS 617 

BOARDS Chapter 8 

UCTURAL SAFETY 302.1 

PORTS, PIPING 407, 41 5 

T 

TING 107 

/IBLE, VENT 503.6.3, 503.10.1 1 , 

503.10.15 

EADS 

Damaged 403.9.1 

Specifications 403.9 

£TS 626 



620 

ISTED BOILERS 632 

ENTED ROOli HEATERS 621 

DITY 106.4.2 

SVIULTIPLE 

; LINES 409.3 

. SHUTOFF 

Appliances 409.5 

503.2.1,503.3.4 

604 

622 

608 

Caps 504.3.13 

Direct vent 503.2.3 

Equipment not requiring vents 501.8 

Gas vent termination 503.6.7 

General Chapter 5 

Integral 505 

Listed and labeled 502.1 

Mechanical vent 505 

T, SIZING 

Category I appliances 502 

Multiappliance 504.3 

Multistory. 504.3.13, 504.3.14, 504.3.15, 504.3.16 

Single appliance 504.2 

301.8 

5 108 

608 

618 

624 

301.10 



FUEL GAS CODE OF NEW YORK STATE 



153 



154 FUEL GAS CODE OF NEW YORK STATE